The Fausto Amphitheatre is the testimony of the importance and the wealth that blessed Terni in Roman times, when its name was Interamna Nahars. An oval structure of huge dimension (97.5 metres long the main axis and 73 metres the other), five concentric circles which were made in masonry, originally two-storied, which could hold a large number of spectators, around ten thousand. A work in masonry, made mostly with sponge stone, the stone mostly cut from the cliffs of Marmore waterfalls. The external perimeter preserves coloured fragments of opus reticulatum realized with local stones. On the ruins the copy of an inscription, wanted by a member of a college that took care of the imperial worship, Fausto Tito Liberale, (from here the name of the Amphitheatre) permits to calculate precisely the date of foundation of the city, I mean in 672 BC.
The original inscription is today visible inside the Archaeological Museum - CAOS - CENTRO ARTI OPIFICIO SIRI.
The importance of the structure, and reflexively of the city, is set also by the memory of the entertainment held there. The historian Francesco Angeloni reported that" gladiator shows" and fights between gladiators and "great fairs" took place in the Amphitheatre.
In the period of decadence, the amphitheatre became a quarry for the construction of other buildings until it became part of the Bishopric vegetable garden.
More recently, it has returned to its original function of place of entertainment, after having been the perfect place for the oratory football pitch. The Municipal performed renovation works after repossession and today it is dedicated to theatre performances and concerts.