On via del Teatro Romano, (a name that recalls the Roman Terni theatre that once stood there and of which only scanty traces remain) lies the mighty building that bears the name of the noble Gazzoli family who commissioned it at the end of the 18th century. The building, designed by the architect Andrea Vici inspired by the architectural style of the late Renaissance Roman palaces, took on some pre-existing properties of the family, located on a large area of modern-day Duomo district. At the time of Interamna, especially between the 1st century BC. and the first century AD century, monumental buildings were built here, such as the nearby Amphitheatre and the aforementioned Theatre. The renovation works of palazzo Gazzoli carried out in the 1990s brought to light the remains of a thermal plant from that period: in the internal courtyard is an apsidal basin belonging to the complex from which also come the fragments of the mosaic floor with tesserae black and white displayed in the entrance hall. The loggia of the large courtyard has grotesque painted vaults; the same decoration adorns some of the halls together with frescoes of mythological subjects made by painter Liborio Coccetti. Vici's design also included the family's private chapel, built next to the building, and the stables, for which the opposite exedra was built. In the 2000s, some halls of this historic residence were used to exhibit the Municipal collection of modern and contemporary art, subsequently moved to the Centro d'Arti Opificio Siri (CAOS) where it is on permanent display. An auditorium has been created inside the Gazzoli building,which is a major location for the town’s musical events ,hosting, among others, important concert seasons.