Rome: Vatican city: St. Peter s Basilica

The Papal Basilica of Saint Peter (Latin: Basilica Sancti Petri), officially known in Italian as Basilica Papale di San Pietro in Vaticano and commonly known as St. Peter's Basilica, is a Late Renaissance church located within the Vatican City. St. Peter's Basilica has the largest interior of any Christian church in the world. It is regarded as one of the holiest Catholic sites. It has been described as holding a unique position in the Christian world and as the greatest of all churches of Christendom.