The remains of the ancient town can be visited
Porta San Giovanni
The Porta San Giovanni, a gate in the Aurelian Wall in Rome, is named after the nearby Lateran Basilica. It marks the beginning of the Via Appia Nuova and is characterized by its simple ashlar construction, adorned with a bearded head on the exterior.
History+
The Porta San Giovanni was built by order of Pope Gregory XIII and inaugurated in 1574. The exact identity of the architect remains a subject of debate; it is presumed that either Giacomo della Porta or Giacomo del Duca, who had previously collaborated with Michelangelo on the Porta Pia, provided the designs.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://en.wikipedia.org/wiki/File:Porta_San_Giovanni_2950.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: 41.8859, 12.5092