Probably one of the least likely places to look for…
Villa Quintilii, located in the Appia Antica surrounding, was constructed in 151 AD by Sextus Quintilius Maximus and Sextus Quintilius Condianus, who were successfull consuls in the 2nd century. Nevertheless, the earliest construction of the villa dates back to the Hadrian rule.
The end of the once influential consul brothers was so sad. It is said, Emperor Commodus so coveted the villa, may be due its location or magnificence, and killed (182 AD) the Quintilii bros and automatically became the heir.
Villa Quintilii was discoverded in 1776 by Gavin Hamilton, in what the locals commonly call Roma Vecchia for after the villa was first excavated, it looked like a small city in itself. This houses extensive thermae with its own water supply system and amazingly a horse race course (dating to the fourth century).
Now, the villa (a state property since 1989) has a museum that houses the marbles and other materials which were used to adorn the villa. In 1784 the villa has to it added a terrace, which give a good view of the Castelli Romani.