The Porta San Paolo is one of the southern gates in the 3rd-century Aurelian Walls of Rome, Italy. The Via Ostiense Museum is housed within the gatehouse.
It is in the Ostiense quarter; just to the west is the Roman Pyramid of Cestius, an Egyptian-style pyramid, and beyond that is the Protestant Cemetery.
Wikipedia https://en.wikipedia.org/wiki/Porta_San_Paolo
Coordinates 41°52'36.121" N 12°28'53.292" E