One of the seven historical hills of Rome in imperial times was a residential area. At North and East is still surrounded with Aurelian Walls in which there is the famous Porta Pia (Porta Nomentana).
The East side housed the vast Baths of Diocletian, built in A.D. 298-306, they were the most extensive in Rome and could accomodate up to 3,000 bathers at a time. Today the Baths stand in front of the main railway station of Rome, the Stazione Termini.
Close to the station is also preserved a fragment of the Servian Wall.