St Peters Basilica
The Basilica Papale di San Pietro in the Vatican City, commonly known as St. Peter's Basilica, is an Italian Renaissance church located in the papal enclave within Rome, Italy. It is one of the holiest sites in Christendom, is the Pope’s principal church and is a famous site for pilgrimage and liturgical functions.
One of the largest churches in the world, it is thought to have been built on the burial site of St. Peter, one of Christ’s Apostles and the first Pope. Continuing this Catholic tradition, Popes are still buried within the basilica.
The original church dated back to around 320 CE, but construction began on the basilica in 1506 and it was only completed in 1626. Its design involved the greatest ‘Old Masters’ of the Renaissance, including Alberti, Raphael, Bramante, Michelangelo, and Bernini.
 Design and construction
Having fallen into disrepair at the end of the 15th century, the Old St. Peter’s Basilica took a typical basilical form – a wide nave, two aisles on each side and an apsidal end. Originally it was only intended to modify the building, but successive Popes decided it should be demolished and replaced with a more monumental structure. A design competition was held by Pope Julius II, and the design of Donato Bramante selected.
Bramante’s design gave the basilica the form of a Greek Cross with a dome inspired by the Pantheon, but rather than being supported by a continuous circular wall, the new basilica’s dome was designed to be supported on four large piers.
With the death of Bramante in 1514, several others were commissioned, each of whom made alterations to the original design. The iconic dome was designed largely by Michelangelo and built around 1585-1590. It was Michelangelo’s intention to realise the central unity of Bramante’s original design while ensuring the stability of the load-bearing structure through the use of four pendentives and massive piers, 60 ft thick.
The top of the dome reaches 136.6 m (448.1 ft) high, making it one of the tallest buildings of the Old World, and it still remains the tallest dome in the world. However, it no longer holds the distinction of being the largest dome by diameter.
St. Peter’s is approached via St. Peter’s Square, a forecourt encircled by a Doric colonnade derived from Greek architecture. The forecourt is split into two sections, the first oval and the second trapezoid. The basilica’s façade stretches across the end of the square, measuring 51 m (167 ft) high and 114 m (375 ft) wide. The façade was designed by Carlo Maderno and features giant Corinthian columns topped by 13 statues.
The basilica is cruciform in shape, with an elongated nave in the form of a Latin cross, adapted from the original Greek cross by successive architects. The nave is framed by a wide aisle giving access to a number of smaller chapels. The interior is lavishly decorated with marble, reliefs, architectural sculpture and gilding.