Descend beneath the modern streets of Rome to uncover a silent, layered world where the city’s earliest secrets are etched into stone and shadow. This three-hour private journey explores the transition from paganism to Christianity, taking you from the extraordinary "time machine" of San Clemente to the haunting, labyrinthine corridors of the ancient catacombs. Led by a certified expert, you will move through Roman houses, hidden Mithraic temples, and early Christian burial cities. This is a profound immersion into the resilience of faith and the physical layers of history that support the Eternal City today.