The remains of the ancient town can be visited
Porta Maggiore
The Porta Maggiore, one of Rome's ancient structures, is more than just a city gate. Originally built as part of an aqueduct that supplied the city with water, it was later integrated into the Aurelian Walls and continues to shape the cityscape of the Italian capital today.
History+
In 52 AD, Emperor Claudius had the future Porta Maggiore constructed as part of the Aqua Claudia to optimize Rome's water supply. This structure carried the conduits of the Aqua Claudia and the Anio Novus over the Via Labicana and Via Praenestina. Towards the end of the 3rd century AD, the structure was integrated into the newly built Aurelian Walls.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:Porta_Maggiore_Roma.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: 41.8914, 12.5152