Located at the northern limits of the ancient town, the building is built from squared, rusticated blocks of limestone. It originally had two tiers of arcades, of which the lower tier and some arches of the upper gallery remain standing. The ruins of walls in opus reticulatum are found in the corridors of the vomitories.
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The floor of the orchestra, paved with limestone, channeled rainwater into a large cistern underneath the pulpitum. The frons scaenae has two rectangular side niches and a semicircular central niche. Pieces of the architectural decoration are kept in the Civic Museum (Palazzo dei Consoli). The museum also holds the remains of an Augustan inscription that refers to repairs done by the town’s magistrate, Cneus Satrius Rufus, who “…at his own expense did the roof of the basilicas, fastened the roof beams with iron, paved the floor with stone…”