The Basilica San Paolo station is located behind a Basilica that is commonly known as what?
Basilica San Paolo (Rome Metro):  It was opened in 1955 and is located behind the Basilica of Saint Paul Outside the Walls (after which it is named) in the Ostiense quarter. Basilica of Saint Paul Outside the Walls: The Papal Basilica of St. Paul outside the Walls (Italian: "Basilica Papale di San Paolo fuori le Mura" ), commonly known as St. Paul's outside the Walls, is one of Rome's four ancient, Papal, major basilicas, along with the Basilicas of St. John in the Lateran, St. Peter's, and St. Mary Major.
St. Paul's outside the Walls