In my opinion, Rome is the most beautiful European capital. So much history in such a small area, without being turned into an amusement park ... where else in Europe can you still find that?
One of the lesser-known sights is San Clemente, a pretty 11th-century church. Stairs lead you down to the remains of a 4th-century basilica, which was devastated by Northmanns. Via another pair of stairs you arrive at a Roman house from the 2nd century, that served as a shrine for Mithras.