Once the biggest basilica in the world, the Basilica of Saint Paul Outside the Walls (Basilica di San Paolo Fuori le Mura) is one of four ecclesiastical basilicas in Rome and among the city's most significant Christian sites! Presumed to be set over the burial chamber of St. Paul, the church has a striking inside beautified with 80 columns and extensive mosaics. As an ecclesiastical basilica, St. Paul Outside the Walls belongs to the Vatican—however is not situated inside the confines of Vatican City—and plays a significant part in Catholic celebration celebrations. Notwithstanding the nineteenth century church with its eminent Gothic baldachin by Arnolfo di Cambio, the complex has a delightful thirteenth century Romanesque cloister worked by the Vassalletto family, and a workmanship exhibition with some of the works that once enriched the basilica.