St. Peter’s Basilica is the largest and most important Catholic church in the world, and is the burial place of St. Peter and many of the popes who followed him. At the heart of Vatican City, the pilgrimage site is also one of the finest examples of Renaissance architecture in existence, combining work by Michelangelo, Donato Bramante, Bernini, and many others, to impressive effect. Entry is free, but a guided tour is recommended to help you find all the hidden details, or you can climb the dome for a stunning view over Rome.