It is unassuming on the outside, plain and simple. It doesn't look like there's anything remarkable about this church. This was my first time here after numerous trips to Rome. San Clemente is actually a very old and very remarkable church.
The interior is so sumptuous with numerous glittering mosaics. I wasn't allowed to take any pictures but I found a way to do it. Nothing stops me. I took them from the outside looking in. Most remarkable of all was thee basement. The underground hides a 1stC, 4thC and Mithraic temple. There are even beautiful frescoes there. Wow!