The 5th-century Basilica of SS. Giovanni e Paolo stands over a residential complex consisting of several Roman houses of different periods. A visit here will provide you with a unique picture of how generations of Romans lived. Preserved at the labyrinthine site is a residence from the a.d. 2nd century, a single home of a wealthy family, and an a.d. 3rd-century apartment building for artisans.

The two-story construction, with some 20 rooms, also contains a small museum room with finds from the site and fragmentary 12th-century frescoes.