The Church of San Silvestro, with its Romanic nave, is certainly one of the city’s most ancient monuments. Thanks to various renovation projects its apse has a classic Latin cross plan. The church is located near the castle and it is said to have been built on the site of a pre-existing pagan temple. Its splendid marble altar is located next to transepts built in the 1800s along with a baptismal font in sculpted marble. Art lovers won’t want to miss viewing a noteworthy fresco by Bartolomeo Valiani  (1838) which depicts San Silvestro as he baptizes Emperor Constantine. In the choral section above the church’s main entrance, you’ll find an organ by Luigi and Cesare Tronci, built in 1862 and decorated with various motifs. This wonderful instrument boasts various features including a 54-key keyboard.