The Basilica of St. Paul Outside-The-Walls (Basilica di San Paolo Fuori le Mura) is located (not surprisingly) outside the walls of the original Rome, and is built on top of where St. Paul is buried. There’s a metro stop just a couple blocks away, so the Basilica is pretty easy to get to.
Going through the front entrance puts you into a nice little garden square with a large statue of St Paul in the middle.
Inside, the Basilica is very long, and like all the churches in Rome, beautifully decorated. On the walls just below the ceiling are mosaics of all the Popes, with the current pope lit up by a spotlight.
I counted about a dozen or so empty spots for future popes. Not sure what happens when those are all filled up.
There’s also a gift shop/book shop here, a little cafe where you can get some food and drinks (including beer…how many churches can you say you’ve had a beer at?!). There’s also an archaeological dig/exhibit, but it wasn’t open when we were there. Looked like it would have been pretty interesting to go through. Near the Basilica is an archaeological dig of a necropolis which looked pretty interesting through the fence.
Definitely worth adding to the list of places to visit when you’re in Rome.