History of the Dome of St. Peter’s

The evolution of St. Peter’s Dome is one of the most fascinating and complex chapters in the history of Western architecture. This architectural feature, which dominates the profile of the Vatican basilica, is the result of a lengthy process of design, revision, and innovation that saw some of the greatest minds of the Renaissance and early Baroque in conversation. From Bramante’s early concepts, envisioning a Greek-cross layout with a central dome and smaller auxiliary domes, to Michelangelo’s revolutionary introduction of the double-shell concept to lighten the structure and enhance its stability, the dome’s history is marked by continuous transformations. After Michelangelo’s death, direction of the project passed to Giacomo della Porta, who consolidated and refined the design choices, adding technical innovations and structural solutions that allowed the work to be completed.

The New Design of St. Peter’s Basilica

In 1506, Pope Julius II della Rovere (Albisola, 1443 – Rome, 1513) decreed the reconstruction of St. Peter’s Basilica, then considered insufficient and in poor condition relative to its ancient Constantinian splendor. In this climate of renewal, the commission was entrusted to Donato Bramante, who developed a revolutionary plan for a church that would embody the renewed spiritual and artistic vigor of the era.

The Idea of the Dome in Bramante’s Plan

In the original design attributed to Bramante, the dome was conceived as a central element, placed above the burial site of St. Peter and set within a Greek-cross layout ¹. The plan further envisioned four smaller domes to complete the composition.

However, devotional considerations—such as the relocation of the Apostle’s tomb and the necessity of respecting the sacred area of the old structure—led to the rejection of the initial configuration. Although Bramante’s vision formed the starting point, liturgical and symbolic requirements demanded a rethinking of the original concept, suggesting that the dome needed to be re-imagined in a more functional manner that respected the sacred space.

Bramante produced a second plan ² featuring a longitudinal layout with an extraordinarily proportioned dome above the transept—an idea influenced by the dome of the Tempietto di San Pietro in Montorio (1502), on Rome’s Janiculum Hill, also designed by Bramante.

The Michelangelesque Phase and the Double-Shell Vision

Michelangelo’s Entry into the Project

In 1547, after decades of work characterized by numerous alternate proposals and revisions, Michelangelo Buonarroti was charged with overseeing the construction of St. Peter’s. Although he found a site affected by decades of building works—featuring interventions by Antonio da Sangallo the Younger and others—Michelangelo seized the opportunity to reorganize the design and establish the foundations for an enduring work of architecture.

The Vision of the Double-Shell Model

Among Michelangelo’s most significant innovations was the notion of a double-shell dome. Although he did not leave behind a definitive global plan—preferring to proceed incrementally and producing numerous clay and wooden models—his contribution was crucial for the dome’s final appearance.

Michelangelo’s proposal featured an internal supporting shell (the internal dome, about 2 meters thick) and a thinner external shell (about 1 meter thick) acting as a protective covering. Inspired in part by techniques used in Florence Cathedral’s dome, this solution aimed to reduce overall weight and ensure balanced load distribution, while preserving both scenic impact and interior luminosity.

The Models and Work Organization

Michelangelo adopted an innovative method, relying on scale models quickly produced to communicate his ideas to the site’s master builders. The “wooden model” for the dome, built between 1558 and 1561, stands as a key testament to his vision. Although these models underwent many alterations, they helped define the dimensions, curvature, and spaces between the shells, serving as a guide for the dome’s subsequent construction.

Completing the Dome: Giacomo della Porta and Domenico Fontana

The Handover and the New Design Phase

After Michelangelo’s death in 1564, control of the project was transferred to Giacomo della Porta, who took on the responsibility of finishing the work as faithfully as possible to the principles articulated by his predecessor. During this period, site management was rationalized, and the fundamental design choices for the dome were solidified.

Modifications and Structural Reinforcement

Della Porta was required to introduce a series of adjustments necessary to integrate and complete Michelangelo’s double-shell design. Key innovations included:

• Adjusting the curvature: To ensure greater stability, Della Porta slightly altered the curvature of the outer shell, making it more pointed. This choice reduced lateral stress, distributing the weight more effectively and allowing the dome to rise in a harmonious manner.
• Structural reinforcement: The addition of tension chains and a system of buttresses and radial supports was pivotal in consolidating the structure, especially given the enormous loads and potential seismic challenges. These elements, integrated into the supporting drum, proved essential in preventing collapse of the masonry.
• Reinforcing the drum: Della Porta also focused on designing and strengthening the drum that holds up the dome. With an internal diameter of roughly 42 meters, the drum was fitted with numerous pillars and arches to fortify its structure, creating a robust base on which to rest the massive dome above.

Construction of the Lanternino

One of the dome’s final and most recognizable features was the construction of the lanternino, located at its apex and amplifying its dramatic effect. Completed toward the end of the late 16th-century building phase, the lanternino functions not only as a decorative element but also has a practical purpose, helping to diffuse natural light into the basilica. Both Della Porta and Domenico Fontana played crucial roles in refining this feature, making it an integral structural and symbolic component of the dome.

Description and Structure

The dome of St. Peter’s, crowning element of the Vatican basilica, reflects an evolutionary journey of technical innovation, engineering solutions, and a richly ornamented program. Initiated in the Michelangelesque phase (1547–1564) and perfected in the post-Michelangelesque period (1574–1602) under Giacomo della Porta and Domenico Fontana, it incorporates solutions that meet both structural requirements and symbolic, devotional needs.

The Double-Shell System

The double-shell solution, devised by Michelangelo, represents the pivotal innovation that made it possible to create a dome that was relatively light yet extraordinarily robust.

Internal Load-Bearing Shell

About 2 meters thick, the internal shell is the structural core of the dome. Its masonry, conceived in the Michelangelesque phase, transfers vertical loads down to the supporting drum, ensuring the overall rigidity of the dome. It also integrates decorative elements on the interior: along its surface, the arrangement of ribs—96 figures in trapezoidal and circular fields—serves both structural and ornamental functions, echoing sacred iconography.

External Protective Shell

The external shell, about 1 meter thick and typically covered with lead sheets, shields the inner structure from the elements and enhances its aesthetic presence. Refined and improved by Michelangelo’s successors in the post-Michelangelesque period, it includes dormer openings of a proto-Baroque design spaced between the shells. These allow natural light to enter and maintain a dialogue between the structural function and the visual impact of the composition.

The Drum and Supporting System

The drum, the load-bearing base of the dome, underwent various modifications over the course of construction.

With an internal diameter of about 42 meters and an average thickness reaching 3 meters in certain phases, the drum is made entirely of travertine. During the Michelangelesque phase, the original Bramante-era pillars outlined its footprint; in the post-Michelangelesque period, the drum was definitively reinforced to ensure an even distribution of loads.

Within the drum, 16 radial buttresses were added to bolster the structure; they enclose large rectangular windows capped by alternating rounded and triangular pediments. Beyond improving support, these elements form an interesting decorative structure echoing classical motifs and papal regal symbolism—such as the triple-mount emblem of Pope Sixtus V carved at the base of each rib.

Structural Reinforcements: Buttresses and Radial Supports

To counteract lateral forces generated by the dome’s weight, additional reinforcements were introduced in the drum. These buttresses and radial supports, implemented by Giacomo della Porta, were designed to channel vertical loads and restrain horizontal stresses. Not part of Michelangelo’s initial plan, they are now essential to the dome’s support system, creating a modular aesthetic that integrates with the external decoration of paired columns, Corinthian capitals, and a high entablature adorned with vegetal garlands.

The Ribs and Reinforcements

The ribs, introduced by Michelangelo, form the internal reinforcement system that defines the dome’s shape and profile.

Structural Purpose and Variable Dimensions

The ribs distribute the dome’s weight along its entire surface, increasing structural cohesion. They taper gradually from the base to the crown, reducing the weight in the upper sections and adapting to the changing stresses. Accurate cutting and assembly of these ribs not only ensure structural integrity but also serve a decorative function: the regular arrangement of the 96 figures placed within the ribs creates a harmonious effect that blends technical and ornamental purposes, enhancing both the lighting and sacred iconography of the dome.

The Lanternino

Set at the very top of the dome, the lanternino is the crowning feature that provides a graceful finish to the entire structure.

Functions and Decorative Details

Introduced and refined in the post-Michelangelesque period, the lanternino not only allows natural light to filter into the basilica—creating luminous effects that enhance the interior—but also helps stabilize the load at the dome’s peak. Its shape, featuring candelabra and ornamental details, is further embellished by a gilded bronze globe topped by a cross. This decorative element, bearing the date of completion (1593, according to the Latin inscription by Giacomo della Porta), lends deep symbolic significance to the dome, serving as a “light-bearing eye” and a distinctive mark of the basilica’s unity of faith and power.

Restorations

Despite the innovative engineering and the mastery of the great architects who built the dome, structural problems arose within just a few decades of its completion, making reinforcing and restoration efforts necessary. Maintenance and improvements have continued over the centuries, with technical solutions evolving in response to natural wear and seismic forces.

18th-Century Restorations: Poleni and Vanvitelli

By the 1630s, structural deterioration had worsened, raising fears about the dome’s stability. Not until the first half of the 18th century did Pope Benedict XIV assign engineer Giovanni Poleni the task of assessing the dome’s deterioration and devising the necessary remedies.

• Poleni’s study and actions: In 1743, Poleni began extensive inspections, compiling data along with earlier reports (including those by Lelio Cosatti) to set the foundation for a structural intervention. In 1748, he published a treatise outlining ideal methods for reinforcing the dome.
• Structural reinforcement: Between 1743 and 1748, Poleni installed several iron chains, primarily in the drum and lower sections of the dome, to enhance overall solidity and stability. These works were carried out under the supervision of architect Luigi Vanvitelli, who, thanks to his expertise, integrated these supports into the existing engineering system.

19th- and 20th-Century Restorations

During the 19th and 20th centuries, attention focused primarily on renewing the dome’s external covering and lantern.

• Roofing replacement: From 1870 to 1875, the lead-sheet roofing of the outer shell was renovated to protect the dome against the elements. As far back as 1809, a lightning rod was added atop the lantern to guard against electrical discharges.
• Consolidation work: After 1929, the radial buttresses showing signs of serious damage were partially dismantled and rebuilt under the direction of architect Luca Beltrami. In the 1940s, due to the failure of the lintel of one of the drum’s windows, engineer Nicolosi had to install a steel frame to transfer the loads from the outer part of the window bay. This intervention was then extended to all the openings of the drum, significantly improving stress distribution and structural security.

Recent Work

On September 2, 2019, a new cycle of restorations began, focusing particularly on the dome’s drum.

• Restoration of the drum and exterior facades: With scaffolding in place, the project addressed the drum and repaired all the basilica’s exterior facades.
• Anchoring issues: This intervention raised concerns due to the method used to anchor the scaffolding: steel tubes were fastened directly into the travertine, causing hundreds of holes to be drilled in the masonry. These issues highlight the challenge of balancing modern restoration methods with preserving the integrity of the historic stonework.

Access to the Dome

Visiting St. Peter’s Dome has been organized to provide a safe and personalized experience, offering two ways to reach the top: by elevator or by stairs.

Access Methods

The Dome by Elevator

This option allows you to ride comfortably up to the terrace level, where you begin your dome visit.

• Elevator ride: The elevator takes you to the basilica’s terrace level. Although the elevator reduces the number of steps, you will still need to climb 320 steps to reach the dome’s summit.
• What’s included: Your reservation includes access to St. Peter’s Basilica (to be used 90 minutes before your Dome entry time) and a Digital Audioguide for an enriched experience inside the basilica and throughout the dome visit.
• Hours and booking: You can reserve online and choose your preferred time. Alternatively, tickets can be purchased at the on-site ticket counters near the basilica, subject to security checks in St. Peter’s Square.

The Dome by Stairs

For a more traditional approach and the challenge of climbing on foot, you can opt for the stairs.

• Climb by stairs: With this option, you climb directly up the steps to the terrace level, following the traditional route that lets you admire mosaic details and decorations along the way.
• What’s included: This ticket also includes access to the basilica with the Digital Audioguide, to be used 90 minutes before your Dome entry time, as well as access to the dome’s interior and exterior walkways.
• Hours and booking: Online reservations allow you to select your preferred time; otherwise, tickets can be purchased on site. Keep in mind that security checks in St. Peter’s Square can involve an average wait of about an hour and a half.

Practical Information for Your Visit

Security Checks and Dress Code

• Security checks: Before entering the dome, you must pass through security at the basilica entrance. If you booked online, you can proceed directly to the entry point once you’ve cleared security; otherwise, tickets can be purchased at the on-site counters.
• Dress code: As the dome is part of the basilica, please wear attire appropriate for a place of worship. Shoulders and knees must be covered at all times.

Preparing for Your Visit

• Duration of visit: The minimum visit time is about 1 hour, although the actual length depends on your pace climbing and how long you stay at the top.
• Booking and QR code: If you purchase online, you will receive your booking QR code via email within 48 hours. Check your spam folder just in case.
• Helpful tips: Wear comfortable shoes. The elevator, if used, takes you only up to the terrace level, while an additional 320 steps (or 551 in total if you don’t use the elevator) remain to reach the very top of the dome.

Accessibility and Restrictions

• Accessibility: The dome visit is not suitable for those with certain health problems, claustrophobia, vertigo, or limited mobility. The activity is not wheelchair-accessible due to the stairs.
• Tickets and hours: Tickets are limited, so it is advisable to book in advance. Once purchased, the dome ticket cannot be modified or refunded and includes access to the basilica with the Digital Audioguide.

Panoramic View from the Dome

From the top of the dome, visitors can enjoy a 360-degree view of the Eternal City, an experience that blends art appreciation with insight into Rome’s urban history.

City Overview

Upon reaching the terrace, visitors can admire the entire structure of St. Peter’s Basilica, Bernini’s renowned colonnade, and many of the historic monuments that define the heart of Rome. The vista spans the ancient streets of the historic center, with its palaces and churches reflecting centuries of history, all the way to the Capitoline Hill and the calm flow of the Tiber.

Ornamental Details and Light

From this privileged vantage point, the dome’s magnificent mosaics and decorations—designed to showcase natural light—reveal themselves in a harmony of colors and shapes that reflects the artist’s vision. The light, streaming in through the lanternino, highlights the interplay of light and shadow, conveying a sense of depth and sacredness throughout the structure.

An Emotional Experience

The overall panorama, spanning from close-up ornamental details to the wide expanse of the city, offers a unique experience: visitors can sense the awe and spirituality that, according to tradition, inspired Michelangelo as he planned the dome.

This sweeping view, encapsulating both the building’s grandeur and Rome’s historical richness, is one of the dome visit’s most captivating features—making the climb an unforgettable experience for any visitor.

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History

Pre-existence: the Magna Chapel

The Sistine Chapel was born from the remains of the Magna Chapel (also Domini Pape Chapel), one of the three structures mentioned by Giannozzo Manetti in the biography of Pope Nicholas V in 1455, located in a Vatican garden called “paradise”. The structure of the Magna Chapel was composed of self-supporting walls made of oblong bricks that developed on three levels.

The most reliable hypothesis is that it was built under Pope Innocent III (1161 – 16 July 1216). There is no doubt that the pope famous for his crusades against heretics built the first hall, which acts as an antechamber for the Magna Chapel. This is in fact perfectly parallel to the Saint Peter’s Basilica and at the same time perfectly aligned on the east-west axis with the future Sistine Chapel (as can be seen from fig. 1). It can be deduced that these were made by the pope himself, and that they represent the “chamber and chapel” mentioned in some biographical documents ¹.

In the copper engraving (fig. 2) dated 1578, the French architect and painter Étienne Dupérac represented the Magna Chapel during the mass of the pontiff before it was rebuilt (lat. “Maiestatis pontificie dum in capella xisti sacra peragantur accurate delineatio”). The interior had a flat wooden ceiling as well as a wooden floor, tapestries with floral decorations on the walls and a large fresco behind the altar already representing the assumption of Mary (note: the people portrayed are disproportionate to the real size ).

Construction

The construction of the Sistine Chapel as we know it today was commissioned by Sixtus IV , elected pope in 1471. The project was born in a more general context of recovery of the monuments abandoned during the Avignon captivity.

Unlike what was stated in a panegyric of Sixtus IV, the Sistine Chapel was not created from scratch, but it was decided to keep the medieval, albeit irregular, walls of the Magna Chapel up to the height of the first frame. The demolition of the Magna Chapel probably began during the second half of 1475, since the new chapel was to be already under construction at the beginning of 1476 ².

The project, by Baccio Pontelli , provided for a substantial strengthening of the walls thanks to a brick curtain, which was started by Giovannino de ‘Dolci (both Florentine architects).

Inauguration

The first mass took place on August 15, 1483, on the occasion of the feast of the Assumption of the Virgin, during which the chapel was consecrated and dedicated to the Virgin Mary.

The pictorial decoration

The pictorial interior decoration work presumably began in the second half of 1481 and ended at least in mid-May 1482. It can be seen from the description provided to us by Andreas Trapezuntius, private secretary of Pope Sixtus IV, who describes the chapel as complete (“omni ex parte” ) as early as the summer of 1482 ³.

The west wall, behind the altar, was painted by Perugino while the vault, decorated with a starry sky, was the work of Piermatteo d’Amelia . In 1481 four panels on the north wall were frescoed by Sandro Botticelli , Cosimo Rosselli and Domenico Ghirlandaio . Subsequently, on the east wall (wall of the entrance to the Aula Prima) the “testament of Moses” and the “Contention around the body of Moses” were made by the Cortonese painter Luca Signorelli .

Julius II and the new vault

The early sixteenth century the Sistine Chapel suffered major damage probably due to the construction sites for the new Saint Peter’s Basilica , which concentrated mainly in an important crack on the vault. Bramante, architect of the palace, worked using a series of metal chains and dabbing the crack, but the starry sky of Piermatteo d’Amelia was irreparably damaged.

Despite the bad relations between the two, Julius II decided to entrust the decoration of the vault to Michelangelo Buonarroti , who returned to Rome in 1508 to sign the contract and start the work.

Damages to foundations and frescoes

The foundations proved to be rather unstable in the years, so much so that on Christmas day in 1522 the collapse of the lintel of the east wall spared Pope Hadrian VI a little, killing a Swiss guard. In an attempt to secure the Sistine Chapel there was further damage to two frescoes belonging to the “Stories of Christ and Moses”, which were subsequently repainted by Hendrick Van de Broeck and Matteo da Lecce.

The last fresco and censorship

Between 1536 and 1541, Michelangelo Buonarroti was commissioned by Clement VII for the enormous fresco of the ” Last Judgment “. For the realization of this work Michelangelo destroyed two lunettes during the plaster laying phase in 1537.

This work, carried out on the west wall behind the altar, provoked important disputes between the then cardinal Carafa (later Pope Paul IV) and Michelangelo. The object of the dispute was the representation of nudes, considered obscene. After Michelangelo’s death (1564), the “Pictura in Cappella Ap [ostoli] ca copriantur” was promulgated by the Council of Trent, a law that censored nudity in religious art.

Daniele Ricciarelli (also known as Daniele da Volterra ) is responsible for the drapes and fig leaves that cover the naked figures, an intervention that was carried out in 1565.

Description

The Sistine Chapel is a rectangular-based structure covered by a lowered barrel vault, in whose intersections with sails lunettes are formed. Under the six lunettes on each side we find the arched windows, the only light source for the environment.

The external measures of the plant have remained those of the Magna Chapel, to which is added the perimeter row of bricks. The overall external dimensions of the Sistine Chapel are:

Interior

Vault of the Sistine Chapel

The vault was built between 1508 and 1512 by Michelangelo Buonarroti. It is considered to be one of the greatest masterpieces of art of all time. Tell the “Stories of Jesus and Moses” before the latter received the “tables of the law”.

Given the importance of this work, we will devote an entire study shortly.

Mural frescoes

The frescoes in the Sistine Chapel follow the rhythmicity of the windows that divide the space. The frescoes can be divided into three different registers:

• Lower: fake curtains on which Raphael’s tapestries were installed
• Intermediate: “Stories of Moses and Aaron on the south wall,” Stories of Jesus “on the north wall
• Upper, side walls of the window niches: figures of the first popes
• Upper, lunettes: frescoes by Michelangelo

West wall (altar)

• Universal Judgment (1536-1541), Michelangelo
• “Birth and discovery of Moses”, Perugino (destroyed)
• “Assunta with Sixtus IV kneeling”, Perugino (destroyed)
• “Nativity of Christ”, Perugino (destroyed)

South wall

• “Departure of Moses for Egypt”, Pietro Perugino and help
• Trials of Moses, Sandro Botticelli and workshop
• “Passage of the Red Sea”, Cosimo Rosselli or Domenico Ghirlandaio or Biagio by Antonio Tucci
• “Descent from Mount Sinai”, Cosimo Rosselli and Piero di Cosimo (attr.)
• “Punishment of the rebels”, Sandro Botticelli
• “Testament and death of Moses”, Luca Signorelli and Bartolomeo della Gatta

Parete is

• “Resurrection of Christ”, Hendrik van den Broeck (1572) on an original by Domenico Ghirlandaio
• Dispute over the body of Moses ”, Matteo da Lecce (1574), based on an original by Luca Signorelli

North face

• Baptism of Christ ”, Pietro Perugino and help
• Temptations of Christ ”, Sandro Botticelli
• Vocation of the first apostles ”, Domenico Ghirlandaio
• “Sermon on the Mount”, Cosimo Rosselli (attr.)
• “Handing over the keys”, Pietro Perugino
• “Last Supper”, Cosimo Rosselli

Barrier

The environment of the Sistine Chapel is divided on the east-west axis by a marble barrier made by Mino da Fiesole, Andrea Bregno and Giovanni Dalmata. This allows to divide spatially the area destined for religious functions (“Sancta Sanctorum”) from that destined for the faithful. Over the years the position has changed: while before it was towards the center of the room, at the height of the “Creation of Eve”, today it is in a more backward position, to give more space to the papal functions.

The supporting base of the barrier is finely decorated with marble bas-reliefs, where the papal coat of arms of Sixtus IV supported by putti stands out, while columns interspersed with metal nets support the architrave. In the center, the passage to the “Sancta Sanctorum”.

The tapestries

During religious celebrations the first level of the walls of the Sistine Chapel was covered by a series of tapestries commissioned by Pope Leo X, designed by Raphael and made by Flemish artists in the workshop of the famous tapestry maker Pieter van Aelst between 1515 and 1521. These tapestries , five meters wide and four meters high, reproduce stories taken from the Gospels and from the “Acts of the Apostles” relating to St. Peter and St. Paul. Today the tapestries are located in the Vatican Pinacoteca, more precisely in room VIII (“Raffaello’s Hall”).

In February 2020, on the occasion of the fifth centenary of Raphael’s death, the tapestries were reinstalled in their original location and admired by the public during visits to the Sistine Chapel.

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Why is it called the Trevi Fountain?

There are various theories regarding the name of the Trevi Fountain:

• It derives from a locality called “Trebium” to the east of Rome, the location of a spring that fed the aqueduct that brought water to this location in the Middle Ages.
• It derives from the word “trivio”, which means “three roads”, because it is situated where three roads meet (the modern Via Poli and Via dei Crociferi to the north and west and Via delle Muratte to the south), or possibly in reference to the three old Roman roads that the Aqua Vergine aqueduct crosses (Via Collatina, Via Tiburtina and Via Nomentana).
• It derives from from the name of a temple in this area dedicated to Juturna, the nymph or goddess fountains, wells and springs, who was invoked during times of drought.

The cutting of the Roman aqueducts

During the sixth century, at the time of the last Gothic war (535 – 554 AD) the 11 aqueducts supplying Rome were cut on the orders of Vitiges, king of the Ostrogoths, when he besieged the city of Rome in 537 AD, or their channels were bricked up by Belisarius (the Byzantine general defending Rome), to prevent the enemy from gaining access to the city by crawling through them (a tactic Belisarius himself had used to conquer the city of Naples the previous year).

Following the siege some of the aqueducts were restored, but by the ninth century those that were still functioning fell into a state of disrepair due to lack of resources for their maintenance, and the Romans went back to the practice of drawing water from the river, wells and local springs.

The Acqua Vergine aqueduct

The original Acqua Vergine Antica aqueduct (in Latin: Aqua Virgo) was completed in 19 BC by Marcus Vipsanius Agrippa, the close collaborator, friend, son-in-law, and lieutenant of the Emperor Octavian Augustus. Its name literally means “Virgin Water” due to the legend that when Agrippa’s soldiers were looking for good spring waters to supply the aqueduct, a local maiden led them to a pure and uncontaminated source.

It ran almost entirely underground and was supported on arches only for the last two kilometres, when it entered the urban areas of ancient Rome. Although it too was cut during the siege of the Ostrogoths it was repaired several times and completely restored in 1453 by Pope Nicholas V.

It still flows to this day. The low calcium content of the waters of the aqueduct probably helped to preserve its channels from mineral deposits, so that it could be kept in use for long periods. Nevertheless, regular maintenance was necessary over the years and its waters had to be stopped several times for these vital interventions.

The source for the waters of this aqueduct is a series of natural springs that fed the river Aniene, the major tributary of the Tiber, 10 kilometres east of Rome (at the locality known as “Salone”). Despite the vicinity of this source the aqueduct has a length of 22 km, since it follows an indirect route, in order to ensure a continual gentle slope as it heads towards Rome.

For about 8 km it runs fairly straight as it follows the Via Collatina through underground channels, but it then abruptly turns north, crossing the Via Tiburtina and Via Nomentana, where it turns west to cross Via Salaria, cutting across reaching the park of Villa Ada. It then heads south-west, passing through the district of Parioli and the western edge of Villa Borghese. The Acqua Vergine goes under the Aurelian walls to finally enter the city centre, skirting the Pincio hill through the gardens of Villa Medici and descending to Piazza di Spagna, where it supplies the Barcaccia Fountain.

It continues south to supply the Trevi Fountain and then turns due west to provide water to the Four Rivers Fountain in Piazza Navona. In this area it originally supplied the Baths of Agrippa, the first public baths in Rome, for which purpose the aqueduct was originally constructed. Next to the baths there was a large artificial lake where visitors to the baths could swim and the used water flowed west from here into the river Tiber.

In the 1930s, due to contamination of the water during its course, a modern pressurised version of the aqueduct, the Acqua Vergine Nuova, which is still fully operational, was built to provide healthy drinking water.

Due to its increased hydraulic pressure it runs more straight when it reaches Rome, and thus has a much shorter overall length of 13 km. Branches of this sister aqueduct and the original Acqua Vergine Nuova now feed several fountains in the centre of Rome, such as those in Piazza del Popolo, the fountain of the Tortoises in Piazza Mattei and the Fontana del Nicchione on Via dei Fori Imperiali.

The Middle Ages

After the 6th century, the Aqua Virgo was restored and altered a number of times, including an intervention by pope Hadrian I in the 8th century. It no longer supplied the Baths of Agrippa and, according to some historical sources, it ended with a small fountain near the present site of the Trevi Fountain.

During the early Middle Ages, since the other aqueducts no longer flowed, wells were dug in order to provide the people with water and many ancient monumental fountains were dismantled in order to reuse their materials. Fountains at the time were low basins supplied by local springs, often near churches so that they could be used for religious rites and celebrations, such as the fountain of the Basilica of Santa Cecilia in Trastevere.

Starting in the late Middle Ages and Renaissance period, after the Popes brought the seat of the Curia (the papal administration) back to Rome from Avignon, some important new fountains were designed and built, including the Trevi Fountain and the fountain of Saint Peter’s basilica.

The Fifteenth and Sixteenth Centuries

The first known image of the Trevi Fountain is a sketch dating to the year 1410, when it consisted of three basins side by side, into which water gushed from three spouts. In 1453, as part of a vast program of renewal of the city of Rome, Pope Nicholas V commissioned the sculptor and architect Bernardo Rossellino and the humanist architect and intellectual Leon Battista Alberti to renovate this fountain and the three pools were united as a broad rectangular basin, in front of a high crenellated wall from which water flowed from three holes.

Above them on the wall an inscription in Latin, surmounted by the papal coat of arms, stated that “The Pontiff Nicholas V, after embellishing the city with monuments, restored the conduit of the Acqua Vergine from its ancient state of abandonment in 1453”. In his De re aedificatoria (“On the Art of Building”), which he presented to Nicholas V in 1452, Alberti stressed the importance of having an efficient water infrastructure in Rome with the best water being used for public fountains. In 1570 another important restoration of the entire Acqua Vergine aqueduct was carried out by Pope Pius V.

The Seventeenth Century

The High Baroque architect and sculptor Gian Lorenzo Bernini created many artworks and monuments in the churches and public spaces of Rome during the papacy of Urban VIII (1623-44), of the Barberini family. After completing the massive bronze canopy or Baldachin in the Basilica of St. Peter’s in 1634, he was given the task of transforming the Trevi Fountain and the adjoining square, near the papal residence at the Quirinal Palace (Palazzo del Quirinale).

It was also quite close to the Barberini family palace (Palazzo Barberini) which had just been completed. The work was partly financed by an extremely unpopular tax on wine. In around 1640 Bernini enlarged the narrow square by demolishing some buildings and he changed the alignment of the fountain, so that it could be seen from the Quirinal Palace. It now faced south, which is its present orientation.

Bernini intended to construct two concentric semicircular basins, with a central pedestal just below the water level to support a statuary group, probably centred on the figure of the virgin known as “Trivia”, (a Roman epithet of the goddess Diana).

But funds for the ambitious project soon dried up (perhaps because the people cut back on their wine consumption!) and following the death of Pope Urban VIII the new pope, Innocent X of the Pamphili family, was reluctant to employ Bernini. He wanted a monumental fountain of his own to glorify his papacy and his family, and so he planned to use the waters of the Acqua Vergine for a new fountain with free-standing figures in front of the Pamphili family palace, in the centre of Piazza Navona about a kilometre to the west of the Trevi Fountain.

It seemed that Bernini’s arch-rival, the architect Francesco Borromini, might get the job, but Bernini was eventually awarded the commission. Known as the Fountain of the Four Rivers, it was completed in 1651.

The Eighteenth Century

In the early eighteenth century, a period in which the Late Baroque or Rococo style was predominant in art and architecture, a series of competitions were organized, in which several sculptors and architects took part, including the Italians Ferdinando Fuga, Luigi Vanvitelli and Nicola Michetti, and the French sculptor Edmé Bouchardon. Carlo Fontana suggested an obelisk standing over a rocky base (inspired by Bernini’s Fountain of the Four Rivers) and Borromini’s nephew, Bernardo Castelli, submitted a plan with a column surmounted by a spiral ramp. Work on the Trevi Fountain was put on hold during the papacy of Innocent XIII (1721-24), whose family, the Conti, dukes of Poli, had recently bought some buildings in the square, in order to create a large mansion. A large monumental fountain would have damaged the newly built Palazzo Poli.

However the abandoned project to create a new Trevi Fountain was soon unearthed again and another competition was held by Pope Clement XII in 1730. When the Florentine Alessandro Galilei won there was a public outcry in Rome over this “foreigner” having been awarded the task, so he was replaced by the Roman Nicola Salvi, an architect in his early thirties, whose scenographic and harmonic plan arranged for the central part of Palazzo Poli to be demolished, to create more space the fountain’s central statuary group.

The horrified Conti family complained about the partial destruction of their new mansion, but the pope decreed that demolition would go ahead and work began in 1732.

Nicola Salvi’s project

The Trevi Fountain as we see it today basically corresponds to Nicola Salvi’s original intention. Water flows into a large shallow basin down a series of rugged rocks made of travertine stone, populated by sculpted allegorical figures, with Palazzo Poli acting as an imposing and grandiose backdrop.

The fountain was inaugurated three times by three different popes:

• a first time in 1735, by Clement XII while the progress of the work was being constantly delayed by quarrels between Salvi and Giovanni Battista Maini, the chief sculptor;
• a second time in 1744, by the next pope Benedict XIV, who entrusted the task to the architect Giuseppe Pannini after both Salvi and Maini had died (in 1751 and 1752 respectively);
• a third and final time in 1762, by Clement XIII, who entrusted the sculptures to Pietro Bracci, as Pannini had tried to depart too much from the original plan.

After thirty years of work the Trevi fountain had finally been completed in the form in which we now see it.

Restorations

The Trevi Fountain has recently been extensively restored two times:

• in 1998 the hydraulic system was equipped with recirculating pumps and the fountain was cleaned and repaired
• in 2014 an extensive restoration of the fountain and a modernization of the square was sponsored by the Fendi fashion company. The façade of Palazzo Poli was consolidated, the basin was waterproofed and the sculptures were restored for a total cost of 2.2 million euros.

Description

The Trevi Fountain consists of a rectangular basin placed in front of the scenic façade connected to the Palazzo Poli, which serves as an architectural backdrop. The architectural complex is composed of:

• Travertine façade (Palazzo Poli)
• Sculptural group in Carrara marble
• Travertine cliff
• Basins

Palazzo Poli and the Façade Framing the Trevi Fountain

The façade of Palazzo Poli, completed in the 18th century as the monumental backdrop to the Trevi Fountain, is an extraordinary example of the integration between architecture and decorative arts. This building, adapted to harmonize with the grandeur of the fountain, embodies the principles of late Baroque classicism, combining balanced proportions with elaborate sculptural decoration.

First Level

The first level of the Palazzo Poli façade, located directly above the sculptural ensemble of the Trevi Fountain, represents a masterful synthesis of architectural rigor and decorative symbolism. This section of the façade acts as a transition between the dynamic energy of the fountain and the monumentality of the palace, characterized by a solemn and refined compositional order. The structure is articulated with pilasters and cornices that create a symmetrical scheme, emphasizing the verticality of the façade. Architectural elements such as windows crowned with alternating triangular and curved pediments introduce rhythm and depth to the elevation, harmonizing with the overall composition. Though seemingly subordinate to the grandeur of the fountain, this portion of the façade plays a fundamental role in visually and symbolically uniting the different components of the ensemble.

The Main Elements of the Façade (Table 36.1):

1. Bas-relief: Agrippa, construction of the Aqua Virgo aqueduct
   Located on the left of the first level, this bas-relief depicts Marcus Vipsanius Agrippa, the Roman general and architect who supervised the construction of the Aqua Virgo aqueduct in 19 BC. The work, attributed to Filippo Valle, celebrates Roman hydraulic engineering and its crucial role in supplying water to Rome, highlighting Agrippa as a symbol of foresight and innovation.
2. Bas-relief: discovery of the Aqua Virgo
   On the right side of the façade, the bas-relief depicts the legend of the discovery of the Aqua Virgo, a spring found by Roman soldiers guided by a young virgin. This work, also attributed to Filippo Valle, embodies the connection between nature and human wisdom, emphasizing water as a gift from the earth.
3. Statue of Abundance
   Above Agrippa’s bas-relief, this allegorical statue symbolizes the abundance brought by water. Created by Agostino Corsini, the figure is depicted with a cornucopia overflowing with fruits and flowers, a classical iconographic element that evokes wealth and fertility.
4. Statue of the Salubrity of Air
   Positioned above the bas-relief of the discovery of water, this statue represents the health and purity that water provides. Attributed to Agostino Corsini, the statue depicts an allegorical figure conveying a message of well-being and harmony, emphasizing the value of water as an essential element for health.

Palazzo Poli: Attic

The attic of Palazzo Poli, located above the first level of the façade, represents the architectural and symbolic crowning of the monumental complex of the Trevi Fountain. This upper level, while maintaining the sobriety of the palace’s architectural lines, stands out for the richness of its sculptural decorations, which converge around allegorical themes of abundance and prosperity.

The attic is designed as a conclusive element, conceived to emphasize the central axis of the complex. The composition is dominated by the papal coat of arms of Clement XII, placed at the center of the structure—a clear reference to the pope who commissioned the fountain. This element, a symbol of papal power and continuity, is flanked by four allegorical statues that amplify its symbolic significance.

The Tavola 36.2 provides a detailed analysis of the main elements composing the attic:

1. Statue of Fruit Abundance
   Located on the left side of the attic, this allegorical statue symbolizes the richness and fertility of nature. Represented with a basket of fruits, it evokes the abundance ensured by water. The work is attributed to Agostino Corsini, a sculptor known for his detailed and naturalistic style.
2. Statue of Field Fertility
   Situated immediately to the right of the Statue of Fruit Abundance, it represents the fertility of the land, with a composition that includes vegetal elements and agricultural tools. This statue, also attributed to Corsini, highlights water’s vital role in agriculture.
3. Coat of Arms of Clement XII
   At the center of the attic, the papal coat of arms of Clement XII, the pope who commissioned the Trevi Fountain, dominates the scene. Sculpted by Filippo Valle, it is adorned with the traditional tiara and crossed keys, symbols of the papacy’s spiritual and temporal power. Its central position emphasizes the connection between the fountain project and ecclesiastical authority.
4. Statue of Autumn’s Wealth
   Located to the right of the coat of arms, this statue celebrates autumn as a season of abundance and harvest. Depicted with elements associated with autumn fruits, it is a work attributed to Bernardo Ludovisi, known for his refined allegorical language.
5. Statue of Meadow Amenity
   On the far right side of the attic, this statue represents the serenity and beauty of nature. The figure is conceived to visually balance the ensemble and complete the symbolic cycle of seasons and prosperity. This sculpture is also the work of Bernardo Ludovisi.

Sculptural Group of the Trevi Fountain

The central sculptural group of the Trevi Fountain, conceived as the narrative and symbolic focal point of the entire monument, represents an extraordinary synthesis of dynamism, allegory, and sculptural mastery. Created by Pietro Bracci in the 18th century, this artistic complex stands out for its Baroque theatricality and its ability to evoke the power and vitality of water.

1. Triton with an Agitated Horse
   On the left of Ocean, a triton struggles to tame an agitated horse, depicted with raised front legs and a flowing mane, in a dynamic and dramatic pose. This scene symbolizes the impetuous and uncontrollable aspect of the sea. The sculpture, attributed to Pietro Bracci, is characterized by extraordinary anatomical detail, giving vitality and realism to the subject.
2. Statue of Ocean (or Neptune)
   At the center of the sculptural group stands the majestic Statue of Ocean, 5.8 meters high, created from an initial design by Giovanni Battista Maini and sculpted by Pietro Bracci. Ocean, the god of waters, is depicted standing on a large shell-shaped chariot drawn by two sea horses. The imposing statue symbolizes the absolute dominance of water. Its solemn posture and hieratic expression evoke authority and control, embodying the connection between the divine and the natural power of water. The use of the shell-chariot recalls the mythological theme of triumph over the waters.
3. Triton with a Calm Horse
   On the right side, a second triton guides a calm horse, which moves with elegance and composure. This element visually and allegorically balances the dynamism of the agitated horse, representing the tranquility and harmony of the sea when it is calm. This work, also attributed to Pietro Bracci, is exemplary for its sculptural precision and its ability to convey serenity and stability.

Artistic and Symbolic Significance

The central sculptural group of the Trevi Fountain conveys a complex symbolic narrative about water. The figure of Ocean, at the center, represents the universal power of the waters, while the two tritons and the horses embody the duality of the sea: untamed force and vital resource. The contrast between the agitated horse and the calm horse emphasizes this dichotomy, creating a visual and thematic balance that enhances the theatricality of the work.

The sculptures integrate seamlessly with the architectural context and the perpetual motion of the water, amplifying the monument’s visual and symbolic impact. The mastery of Pietro Bracci, visible in the detailed rendering of the characters and the dramatic use of contrasts, elevates the sculptural group to a sublime example of Roman Baroque sculpture.

Traditions

The practice of tossing a coin into the Trevi Fountain is well-known throughout the world, and has been made famous by songs and films such as Three Coins in a Fountain, and no self-respecting tourist can fail to follow this romantic custom. Less widely-known is the equally romantic (but more risky) tradition of the glass of water.

The Trevi Fountain coin toss

According to the legend if you visit Rome you must toss a coin into the water of the central basin, with your back to the fountain, flipping it with your right hand over your left shoulder. If you can turn round quickly enough to see the coin splash into the water, you will be sure to return to Rome one day.

This tradition dates back to the custom of the ancient Romans of throwing coins into water so that the gods would protect them if they travelled over the sea, and help them to return home safely. A variant of this legend, which inspired the movie Three Coins in a Fountain, says that if you throw three coins into the fountain at once, the following three things will come true:

1. you will return to Rome
2. you will meet the love of your life
3. you will get married

The glass of water

This tradition is no longer in use, due to the poor quality of the constantly recycled water, and is little known today. In the past if a girl’s boyfriend had to leave the city for work or military service, she would make him drink some water taken from the fountain out of a new glass and then she would break it. This magic ritual was supposed to ensure his eternal fidelity, even when he was far away.

The Little Fountain of Lovers

Today there is a safer version, which avoids the risk of having a stomach upset. The two lovers drink together from the so-called Fontanina degli Innamorati, or “Little Fountain of Lovers”, located to the right of the monument underneath the so-called asso di coppe (ace of cups), a sort of urn which stands on the balustrade that runs alongside to the road above. This small fountain has two jets of drinking water and in this way a couple can make sure that they will always remain faithful to each other.

What happens to the coins?

In high season about 3,000 Euros are thrown into the fountain every day. The coins are fished out at dawn every day every night and given to an Italian charity called Caritas, which uses the money to fund a program of vouchers for the needy and poor of Rome so that they can obtain supermarket groceries. It is now illegal to take coins from the fountain, but thieves used to do this at night.

The most famous and elusive of them all was a certain Roberto Cercelletta, also known as d’Artagnan, the fourth musketeer. He managed to steal coins from the fountain using a rake and a magnet for 34 years while the police turned a blind eye. When the media reported that he was taking as much as a thousand Euros every night he was caught red-handed in 2002, although when the case went to trial judges never found a legal basis to charge him with a crime.

Curious facts

The urn that blocks the view of the fountain

While the fountain was being built near the point where Via della Stamperia enters the square there was a pharmacy (although some say it was a barber’s shop), whose owner insisted on putting up a big sign which spoiled the view of the monument (some say he also criticised Nicola Salvi’s artistic decisions).

In order to prevent him from seeing the progress of the work, and to block the view of his shop sign Salvi therefore decided to erect a large urn made of travertine statue right in front of his premises. Due to its similarity to the “Ace of Cups” a playing card in the deck of cards commonly used in Italy, the Romans renamed it the Asso di Coppe.

When the Trevi Fountain turned red

On two recent occasions the waters of the Trevi Fountain turned red. In 2007 Graziano Cecchini, a self-proclaimed modern day “futurist artist”, poured red dye into the fountain. He pulled the same stunt again a decade later in 2017, this time claiming that it was an act of protest to raise awareness of government corruption, adding that the performance was intended to “shake people’s souls”, because Rome was ready to be “the capital of art, of life and of rebirth”.

Instead many commentator saw his actions as a pointless publicity stunt amounting to vandalism. Fortunately, in both cases, the red dye did not leave any permanent stains or marks on the monument.

The Trevi Fountain in cinema

There are many scenes in Italian and international movies featuring the Trevi Fountain. These are some of the most important scenes that have made cinematographic history.

“La Dolce Vita” by Federico Fellini

In 1960 the Roman director Federico Fellini shot one of the most famous scenes from the film “La Dolce Vita” in the waters of the Trevi Fountain. The Swedish actress Anita Ekberg wades into the large basin of the fountain wearing a long dark evening dress and invites Marcello Mastroianni to join her, calling to him with the words “Marcello, come here! Hurry up!”.

“We All Loved Each Other So Much” by Ettore Scola

In 1974, the director Ettore Scola paid tribute to the above-mentioned scene from “La dolce Vita”, by restaging the set and integrating it in his own film “C’eravamo tanto amati” (We All Loved Each Other So Much) to create the scene in which the hospital porter Antonio, played by Nino Manfredi, chances to drive into the square where he sees the aspiring actress Luciana, played by Stefania Sandrelli, with whom he has been in love for years.

“TotòTruffa 62” by Camillo Mastrocinqe

In this comedy film from 1961 the conman Antonio, played by the actor Totò (Antonio de Curtis), pretends to be the nobleman Antonio Trevi who is the owner of the Trevi Fountain. Thanks to his sidekick Camillo, masquerading as another potential buyer, he swiftly manages to swindle 500 thousand liras out of an ingenuous businessman as a deposit for the sale of the Trevi fountain.

Useful information

Where is it?

The Trevi Fountain is located two blocks southeast of the junction between Via del Corso and Largo Chigi (the continuation of Via del Tritone). It is situated in Piazza di Trevi between Via Poli to the west, Via della Stamperia to the east and Via delle Muratte to the south. The Quirinal Palace complex rises just 100 meters to the southeast on the Quirinal Hill.

How to get there

The nearest metro station is Piazza di Spagna, 500 meters due north. From here you should walk past the Spanish Steps and go along Via di Propaganda and Via di Sant’Andrea delle Fratte. In Largo del Nazareno turn left, cross Via del Tritone and take Via della Stamperia, bearing to the left. After 100 meters you will see the Trevi fountain on your right.

If you travel by bus, the nearest stop is San Claudio, at the end of Via del Tritone. The bus lines 492, 51, 52, 53, 62, 63, 71, 80, 83 stop here. The night buses N12, the N4 and the N5 also pass through here.

Opening times and ticket prices

The Trevi Fountain is a monument in an open public square, and it is open to the public free of charge 24 hours a day.

L'articolo The Trevi Fountain proviene da ArcheoRoma.