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The Papal Basilica of Saint Peter (Latin: Basilica Sancti Petri) is a Late Renaissance church located within the Vatican City. It has the largest interior of any Christian church in the world, holding 60,000 people and it is regarded as one of the holiest Catholic sites.

In Catholic tradition, the basilica is the burial site of its namesake Saint Peter, who was one of the twelve apostles of Jesus

Source: Wikipedia