MUSSOLINI'S VILLA is now open to the public, according to the A.P. As noted before here, there are archaeological relics associated with its underground bunkers:

The bunker was dug 23 feet deep, burying a 10-foot-thick concrete box with bare cylindrical corridors and multiple escape routes.

While restoring the chamber, archeologists discovered it was built over a second-century Christian tomb, in which they found three bodies. The area was a common burial ground in Roman times, housing mainly the sprawling underground corridors of one of six Jewish catacombs in the city.

[...]

Future plans for Villa Torlonia's grounds include opening the ancient Jewish catacombs and building a museum dedicated to Holocaust victims right across from Mussolini's residence.

This is the first I can recall hearing about a second-century Christian tomb at the site.