Explore the hidden layers below St. Clement's Basilica: Christian frescoes in a 4th-century church, a rare Mithraeum, and see an underground stream flowing beneath your feet in a semi-private tour.
Explore the hidden layers below St. Clement's Basilica: Christian frescoes in a 4th-century church, a rare Mithraeum, and see an underground stream flowing beneath your feet in a semi-private tour.