Explore the impressive underground tunnels of the Catacombs of Rome; wander along the rustic Appian Way and under the arches of the aqueducts of antiquity, still preserved from Ancient Rome. Visit the Catacombs of San Callisto and San Sebastiano, once the grave of the martyr Saint Sebastian; you can even take a look inside. See the tomb of Caecilia Metella and gaze in amazement at the original Roman cobblestone streets and the antique aqueducts along the Appian Way. During the tour, find out how the Catacombs were used and how the city's water supply was guaranteed; hear how to this day, even the famous Trevi Fountain is fed by an ancient water system, with water pumped from the surrounding area.