The remains of the ancient town can be visited
Porta San Paolo
The Porta San Paolo, once known as Porta Ostiensis, is an ancient city gate that is part of the Aurelian Walls in Rome. It marks the beginning of the Via Ostiense, an ancient thoroughfare that led to the port of Ostia and remains one of Rome's busiest streets today. Its proximity to the Pyramid of Cestius makes it a landmark in the cityscape.
History+
Originally, the gate featured two arched travertine passages, flanked by two semicircular brick towers. One of the two gates was demolished in 1888. The Porta San Paolo, still standing today, was redesigned under Emperor Honorius, with the towers raised and the structure reinforced for defensive purposes.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:Roma-Porta_San_Paolo.JPG
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 41.8767, 12.4815