Enjoy a fully guided semi-private tour of the mysteries of underground Rome with maximum of 6 people, and an expert guide. Discover how Rome was built in layers at the fascinating Basilica of St Clement, a medieval basilica with stunning gold Byzantine mosaics that were built on top of a 4th-century church, on top of a 2nd-century pagan temple to Mithras on top of a late 1st-century Roman house! Next adventure to the ancient Christian catacombs, a labyrinth of miles of tunnels for graves and burials, dug by and for the very first illegal Christians – an awe-inspiring experience!