Old Ruins to explore in Vatican City
It is the smallest country in the world, and the center of Roman Catholic Church.
The suspected grave of Apostle Peter is located in the Vatican Necropolis. The Necropolis lies nder the Vatican City, 5-12 meters below Saint Peter's Basilica, and it was originally a burial ground outside of the the city walls of Rome. Guided tours can be arranged here in advance, if you contact the office of the Vatican sponsored archaeological excavations(scavi).