Cathedral (Duomo), founded in the 10th century. Due to the repeated reconstruction, little remains of the original edifice. The Romanesque crypt shows parts which could belong to several pre-existing buildings, including Roman or earlier ones.
Church of Santa Menna (10th century).
Castle, used as Ducal Palace.
Palace and church of St. Francis (1282).
Gothic church of the Annunziata (13th century). It houses 15th-century frescoes, and a diptych of the Annunciation dating to the same age.