Historical Notes
The Basilica stands on the site where, according to tradition, the Apostle Peter was buried. The first structure was erected in 324 AD by Emperor Constantine and remained standing for over a millennium. In the mid-15th century, Pope Nicholas V began its renovation, but it was not until 1505, under Julius II, that the decision was made to completely rebuild it. The construction site, inaugurated in 1506 with the laying of the cornerstone by Donato Bramante, continued for over a century, witnessing the work of such absolute geniuses as Raphael, Michelangelo, Baldassarre Peruzzi, Giacomo della Porta, and Carlo Maderno.

Bernini's Facade and Piazza
The imposing façade, completed by Carlo Maderno between 1608 and 1614, is punctuated by Corinthian columns and surmounted by colossal statues of Christ and the Apostles. At the center stands the Loggia delle Benedizioni, site of the famous announcement of the papal election (Habemus Papam).
In front of it lies Gian Lorenzo Bernini's urban masterpiece: an elliptical colonnade of 284 columns that, like open arms, symbolize the Church's embrace of the faithful. The balustrade features 140 statues of saints, with the figure of Christ placed at the center.

The Vatican Obelisk and Curiosities of the Square
At the center of the square stands the Vatican Obelisk, transported from Heliopolis to Rome by Caligula in 40 AD. Originally located in Nero's Circus—the scene of Peter's martyrdom—it is the only ancient obelisk in Rome never to have fallen. In 1586, at the behest of Sixtus V, the architect Domenico Fontana accomplished the engineering feat of moving it to its current location. At the foot of the obelisk, in the 19th century, the astronomer Filippo Gilii created a sundial and a compass rose integrated into the pavement.

The Dome and the Splendor Within
The Basilica is dominated by Michelangelo's majestic Dome, the pinnacle of Renaissance architecture at 136 meters high. The interior, in the shape of a Latin cross, opens with a 186-meter-long central nave that houses priceless treasures:

• Michelangelo's Pietà: Located in the first chapel of the right nave, it is an early masterpiece by the master, a work of moving technical and spiritual beauty.
• Bernini's Baldachin: A monumental bronze structure (1624-1633) that surmounts the papal altar, erected directly above the confessional and the tomb of Saint Peter.
• The Statue of Saint Peter: A 13th-century bronze work attributed to Arnolfo di Cambio; The statue's right foot appears smoothed by the centuries-old touch of pilgrims as a sign of devotion.
• The Rota Porphyretica: A red porphyry disk surviving from the old basilica, located on the floor of the central nave. Charlemagne and numerous emperors knelt on this marble to receive the crown from the Pope.

Monuments and Chapels
Among other treasures, the Baptismal Chapel by Carlo Fontana, which reuses the porphyry sarcophagus of Emperor Hadrian, the funerary monuments of Alexander VII (by Bernini), and that of Clement XIII, a sublime neoclassical work by Antonio Canova, stand out. The Basilica ideally concludes with the Chair of St. Peter, a spectacular baroque reliquary located in the apse.