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Discover two of Rome's hidden gems: the 12th-century Basilica and the ancient site of San Clemente, located just a short distance from the Colosseum. Explore this remarkable location’s three underground floors to uncover its more than 2,000-year history. The basilica's underground levels remained undiscovered until 1860 when an Irish Dominican Roman Catholic priest and archaeologist uncovered them following a flood.
Delve up to 100 feet below the surface even as excavations continue. On the lowest level lies a fourth-century basilica that had been forgotten by the time the 12th-century basilica was constructed above it. Further down, you'll find an ancient Mithraic temple complete with its altar.
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