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The Papal Basilica of Saint Peter in the Vatican (Latin: Basilica Sancti Petri), officially known in Italian as Basilica Papale di San Pietro in Vaticano and commonly known as Saint Peter's Basilica, is a Late Renaissance church located within Vatican City. Designed principally by Donato Bramante, Michelangelo, Carlo Maderno and Gian Lorenzo Bernini, St Peter's is the most renowned work of Renaissance architecture[1] and remains one of the largest churches in the world.[2] While it is neither the mother church of the Roman Catholic Church nor the cathedral of the Bishop of Rome, Saint Peter's is regarded as one of the holiest Catholic sites. It has been described as "holding a unique position in the Christian world"[3] and as "the greatest of all churches of Christendom".[1]

http://en.wikipedia.org/wiki/St._Peter's_Basilica