Explore 2 contrasting underground sights with an expert guide. Discover a hidden gem 14m below St. Clement’s Basilica and descend into the twisty tunnels of the Roman Catacombs. Meet your guide in front of St. Clement's Basilica and venture deep underground below its foundations into a mystical world of ancient cults and legends. Journey through several layers of history and earth, down to 14 meters below ground. Live the excitement of gradually exploring the later structures built on top of it on your way up to the surface. Go back in time down to the deepest point and discover the best-preserved Mithraic temple of the city. Touch the waters of an underground stream before going higher into the remains of the 4th Century Basilica, built on top of the martyr’s house and below the actual one. Walking along its imposing walls, you will be fascinated by the ancient frescoes while learning about the scenes and lives of the martyrs they portray. Then you will journey outside the city walls to one of the largest and most ancient catacombs, the otherworldly crypts of Domitilla. Descend 16 meters below the surface and explore the accessible part of its vast labyrinth of underground burial chambers and galleries revealing the shift of faith from paganism to Christianity.