Cross three layers of history and earth as you venture 14 meters below St Clement's Basilica. Discover the best-preserved Mithraic temple of the City 14 meters underground. Find out about the pagan cult of Ancient Romans before Christianity and be intrigued by its sectarian and esoteric side. Meet your guide after checking in at the meeting point and head towards Rome's best-kept secret. Learn about the early-Christian persecutions, martyrs and hear the legend of St. Clement, while standing in the 1st Century structure that was once his home. Feel the eerie atmosphere and touch the waters of an underground river. Journey higher into the remains of the 4th Century Underground Basilica, built on top of the martyr’s house and below the actual one. Walk along its imposing walls and be fascinated by the ancient frescoes while learning about the scenes and the lives of the martyrs they portray. End your tour in the beautiful 12th-century Basilica at ground level. Marvel at the stunning golden mosaic in the apse, and learn about the hidden symbolism in it.