It's interesting to delve into differing beliefs. An outing to Santi Quattro Coronati is a good way to deepen your understanding of a part of the local culture.
When you've spent a bit of time at this house of prayer in Rome City Centre, why not check out St. Peter's Basilica, Roman Forum, and Piazza Navona? They're not too far from Santi Quattro Coronati and also popular with tourists.