Papal Basilica of Saint Paul Outside the Walls

Rebuilt after a devastating 1823 fire largely to its ancient plan, the basilica houses medallion portraits of every pope in history running around the nave — tradition holds that when the space runs out, the world will end. Its sheer size rivals St. Peter's, yet its location outside the old city walls keeps visitor numbers far lower, making it one of the more peaceful major basilicas to visit. The tranquil cloister, with its twisted Cosmatesque columns, is a highlight often missed by visitors who don't venture past the main nave. It's a strong pick for travelers who want the grandeur of Rome's great basilicas without the St. Peter's crowds.