Discover another Rome beneath the known monuments, where a silent city is revealed underneath the grandiose Renaissance and Baroque architecture. We start at the beautiful Basilica of San Clemente to admire its unique mosaics and crucified Christ in a festival of trees and doves. Not far from the mosaics lies the Cappella di Santa Caterina. A small stairway will take you to the lower basilica, built in the 4th century AD. From here, another staircase leads to the 3rd underground level from the 1st century AD. Some of the rooms were part of an apartment block separated by a passable street from another large building that was perhaps a state mint.