Some remains of Roman and Byzantine buildings were excavated at the beginning of 1990s. The major one — Domus — is a 14-rooms building with 3 courtyards. The floors in these underground rooms are covered with splendid polychrome mosaics, hence the name was given to this place Tappeti di Pietra (Stone Carpets). The entrance to the archaeological site is from the 18th century chiesa di Sant'Eufemia. Adjacent 15th century Oratorio dei Cento Preti is also a part of the museum.