This unusual walking tour takes you underground, to the secret world beneath the churches of Rome and to the catacombs, the ancient cemetery of the first Christians. Discover layers of history beneath San Clemente - including ancient churches, pagan temples and an underground river - explore the Roman houses buried under the church of Santi Giovanni e Paolo and wander through the dark tunnels of the catacombs, where thousands of Christians were buried. On this tour, recently chosen by Independent Traveler as one of the best walking tours in the world, you’ll realise that some of Rome’s most fascinating history is hidden underground. If any site is closed, it will be replaced with another.