The Basilica of Saint Paul Outside the Walls is one of Rome's four ancient major basilicas or papal basilicas.

The Tre Fontane Abbey, also known as the Abbey of the Three Fountains, is a religious complex in Rome, Italy.

The Archbasilica of Saint John Lateran is the cathedral church of Rome and serves as the seat of the Roman Pontiff.

Santa Maria Maggiore is one of the four Papal basilicas in Rome.

The Territorial Abbey of Santa Maria di Grottaferrata is an ecclesiastical circumscription immediately subject to the Holy See.

Antium is a titular see in Anzio, Italy that came into existence in 1969.

The Abbey of Saint Scholastica is one of the oldest monastic communities in Europe.