The largest church in the world by interior floor area, Saint Peter’s Basilica stands over the traditional tomb of the apostle for whom it is named, at the heart of Vatican City. It is not the cathedral of Rome — that distinction belongs to St. John Lateran — but it is the principal papal church, one of the four Papal Major Basilicas, and one of the Seven Pilgrim Churches.
Daily (from June 1): 7:00 a.m.–8:00 p.m.
Hours vary around papal general audiences and events (opens later after morning papal events, closes earlier before evening ones). Free entry, security screening, strict dress code (knees and shoulders covered).