The so-called "Villa Romana del Casale" (of Roman date) and the nearby settlement of Piazza Armerina, which seems to have been occupied by survivors from the villa site after it was destroyed in an earthquake in the early middle ages. The villa is listed as a UNESCO World Heritage Site, in part because of its famous mosaics.
Description via Pleiades. Coordinates and heritage data from the Atika atlas.
Atika pings you when you walk or drive past heritage like this. Works offline, no account needed to explore.