The city, which has preserved its medieval urban layout intact (12th–13th century), is surrounded by walls with towers and gates. In the upper part, it retains numerous remains from the Roman period: the remains of a temple, the theater, and a thermal complex, of which a frigidarium survives, preserving a splendid 2nd-century AD floor mosaic made of black and white tesserae depicting figures from the marine world.
Built upon the layout of the Roman city, the medieval urban structure developed with squares and noble palaces. Overlooking the beautiful Piazza Silvestri is the Palazzo dei Consoli (1270), which houses the Teatro Torti, as well as the Romanesque churches of San Silvestro and San Michele, both dating from the late 12th century, and the Church of San Domenico e Giacomo (1291).
