Basilica di San Pietro
Founded on the site of the tomb of St. Peter, St. Peter’s Cathedral is the largest and perhaps the most magnificent church in the world.
Piazza San Pietro (click for google map) | Wikipedia en.wikipedia.org/wiki/St._Peter%27s_Basilica
Quick Facts:
St. Peter’s Cathedral is home to Michelangelo’s Pieta (1498–1499) and several works by Bernini including the Baldacchino (1623–34), Cathedra Petri (1647–53) and St. Longinus.