The Roman town of Urbis Salvia (40 hectares) is enclosed by great walls. It is still rich in monuments and it has an articulated urbanistic structure. As a matter of fact, Urbis Salvia was first a Roman town, and then a colony in the first years of the 1st century AD. It is possible to visit the Theater, one of the largest in the Marches region; the Amphitheater, with its charming oak crown running along its perimeter; the sacred area with the Temple and the Criptoportico, an underground passage decorated with frescoes. Other interesting structures are the Aqueduct Reservoir made by two parallel galleries and the "Edificio a nicchioni", on the plain where the Theater develops, with traces of frescoes. The State Archaeological Museum completes the visit.