St. Peter`s Basilica (Basilica di San Pietro) is the largest Christian church in the world, the main cathedral of the Vatican, and the spiritual center of the Catholic Church. It rises on St. Peter`s Square, in the very heart of the Vatican, and for almost two thousand years has remained a place of pilgrimage for millions of believers and tourists from all over the world. The basilica is not only an outstanding architectural monument, but also a living shrine connected with the name of the Apostle Peter, the first bishop of Rome.
The modern building of the basilica is the result of a grandiose construction that lasted more than one hundred and twenty years (1506–1626) and united the work of several generations of the greatest architects and artists of the Renaissance and Baroque eras. Its dome still remains one of the most recognizable architectural images in the world, and the interior impresses with its scale, luxury, and the number of masterpieces.
What Was on This Site: The Ancient Basilica and Peter`s Preaching
The history of St. Peter`s Basilica begins not in the 16th century, but in the first decades of Christianity. According to tradition, the Apostle Peter — one of the twelve disciples of Christ, whom Jesus called the "rock" on which He would build His Church — came to Rome and preached Christianity here. He became the first bishop of Rome and suffered a martyr`s death around 64–67 during the persecution of Emperor Nero.
According to tradition, Peter was crucified upside down on the Vatican Hill, near the Circus of Nero, and buried nearby.
On the site of his supposed tomb, Emperor Constantine the Great in the 320s ordered the construction of the first basilica — the so-called Old St. Peter`s Basilica. It was consecrated around 330 and for more than a thousand years remained the main church of the Christian world. It was a monumental building with five naves, a colonnade, and many tombs and altars. Holy Roman Emperors were crowned here, and the most important church events took place here.
By the 15th century, the old basilica had fallen into decay, its walls had begun to sag, and the popes decided to build a new, more majestic church. In 1506, Pope Julius II laid the first stone of the new basilica, and one of the most grandiose construction projects in European history began.
The History of the Construction of St. Peter`s Basilica
The construction of St. Peter`s Basilica continued from 1506 to 1626 and passed through the hands of several outstanding architects. The first project was undertaken by Donato Bramante, who proposed a plan in the form of a Greek cross with a central dome. After his death in 1514, the work was continued by Raphael, then by Antonio da Sangallo the Younger, and in 1546 the leadership passed to Michelangelo Buonarroti.
Michelangelo made a decisive contribution to the appearance of the basilica: he simplified the plan, returning to a central-domed composition, strengthened the massiveness of the walls, and created the design of a grandiose dome, which became the architectural dominant of the entire structure. He directed the construction until his death in 1564, having managed to complete the drum of the dome.
After Michelangelo, the construction was continued by Giacomo della Porta and Domenico Fontana, who completed the dome in 1590. In the 17th century, Carlo Maderno expanded the plan by adding a longitudinal nave, which turned the basilica from a central to a longitudinal one. The façade was completed by Carlo Maderno in 1612, and the final consecration of the basilica took place on 18 November 1626 under Pope Urban VIII.
Later, in the 1660s, Giovanni Lorenzo Bernini created the famous colonnade on St. Peter`s Square, as well as many interior works, including the baldachin over the main altar.
Architecture and Dimensions of St. Peter`s Basilica
St. Peter`s Basilica is a grandiose structure that impresses with its scale. Its length is about 211 meters, its width is about 137 meters, and the height of the dome together with the cross reaches 136 meters. The height of the dome itself from the floor to the top of the cross is about 136 meters, and the diameter of the dome is about 42 meters, which makes it one of the largest in the world.
The interior space of the basilica can accommodate about 60,000 people — a figure that emphasizes its scale. The height of the naves reaches 45 meters, and the total area of the basilica exceeds 15,000 square meters. The façade, completed by Carlo Maderno, has a width of about 114 meters and a height of 45 meters; it is crowned by an attic with 13 statues — Christ, John the Baptist, and eleven apostles.
The architecture of the basilica combines elements of the Renaissance and Baroque. The plan is a Latin cross with a longitudinal nave and a transept. Along the walls are chapels and altars, and in the center, under the dome, is the main altar with Bernini`s baldachin.
The Dome of St. Peter`s Basilica
The dome of St. Peter`s Basilica is its main architectural and engineering pride. Created according to Michelangelo`s design, it was completed by Giacomo della Porta and Domenico Fontana in 1590. The dome has a double shell: the inner and outer structures are connected to each other, which gives it strength and lightness. The diameter of the dome is about 42 meters, and the height from the floor to the top of the cross is about 136 meters. It is one of the largest domes in the world, surpassed only by the dome of Hagia Sophia in Istanbul and Brunelleschi`s dome in Florence.
The dome rests on a drum with paired columns and windows, through which light enters the interior. Outside, the dome is crowned with a lantern and a cross. Inside the dome, at its base, there is an inscription in Latin: "Tu es Petrus, et super hanc petram aedificabo Ecclesiam meam" — "You are Peter, and on this rock I will build My Church."
The dome is visible from many points in Rome and is one of the symbols of the city. Its image can be found in paintings, postcards, and films — it is not just an architectural element, but a visual image of the Catholic world.
Climbing the Dome
Climbing the dome of St. Peter`s Basilica is one of the most popular activities among tourists. It opens a panoramic view of Rome and the Vatican that cannot be forgotten. The climb is possible in two ways: on foot (551 steps) or by elevator to the roof level, and then on foot (about 320 steps).
First, visitors ascend to the observation deck at the level of the dome`s drum, from which a view of the interior of the basilica from above opens up — you can see the mosaics of the dome and the altar. Then, if health permits, you can continue the climb inside the dome — along narrow spiral staircases that lead to the very top, to the lantern. From there, a panorama of Rome opens up: St. Peter`s Square, the Vatican Gardens, the domes of churches, the rooftops of the city, and the hills on the horizon.
The climb requires physical effort, especially in hot weather, but the view is worth it. It is recommended to come early in the morning or closer to evening to avoid queues and heat.
The Interior of St. Peter`s Basilica
The interior of St. Peter`s Basilica impresses with its scale and richness. The interior space is decorated in the Baroque style: marble floors, gilded cornices, stucco, mosaics, and sculptures. Along the walls are numerous chapels and altars, each of which is a work of art.
The central place is occupied by the main altar with Bernini`s baldachin — a bronze structure about 29 meters high, installed in 1633. The baldachin rests on four twisted columns and is crowned with angels. Beneath it is the tomb of St. Peter, as well as the papal altar, where only the pope serves.
The basilica contains mosaics — many of them are made after paintings by famous artists. The mosaics cover the walls, domes, and altars, creating a sense of light and color. The mosaics in the dome and in the Chapel of St. Peter are especially famous.
Among the main works of art in St. Peter`s Basilica:
• Michelangelo`s "Pietà" — the famous sculpture of the Virgin Mary holding the body of Christ on her lap. Created in 1499, it is the only signed work of Michelangelo. It is located in the first chapel of the right nave and is protected by glass.
• Bernini`s Baldachin — a bronze structure over the main altar, a symbol of the pope`s power.
• The Chair of St. Peter — an altarpiece in the apse, created by Bernini, with a chair decorated with ivory and gold.
• The Statue of St. Peter — a bronze statue of the apostle, whose foot is worn away from the touch of believers.
• The Tombs of the Popes — many popes are buried in the basilica, including Julius II, Paul III, Urban VIII, and others. The tombs were made by famous sculptors.
• The Mosaic "Transfiguration" — after Raphael`s painting, one of the most famous mosaics of the basilica.
Practical Information
• Address: Piazza San Pietro, Città del Vaticano.
• Getting there: metro line A, Ottaviano — San Pietro station; trams and buses to the stop Risorgimento.
• Opening hours: the basilica is open daily from 7:00 to 18:30 (in summer until 19:00). The dome is open from 8:00 to 17:00 (in summer until 18:00). On Wednesday mornings, the basilica may be closed due to the papal audience.
• Tickets: admission to the basilica is free. Climbing the dome is paid: on foot about 8 euros, by elevator — about 10 euros. Discounts are available for children and seniors.
• Tips: dress modestly — shoulders and knees must be covered (otherwise you will not be allowed in); come early in the morning to avoid queues; do not forget about climbing the dome — it is one of the best observation decks in Rome; wear comfortable shoes.
St. Peter`s Basilica is a place where in one visit you can see almost two thousand years of history: the tomb of the Apostle Peter, over which Constantine built the first basilica, Michelangelo`s dome, which defined the appearance of European architecture for centuries to come, Bernini`s baldachin, mosaics, sculptures, and the tombs of the popes. No other church in the world unites so many great names and eras in one space.
