The small museum is inside the little cloister, and is rich in interesting historical and artistic evidence. Most of the works of art come from the Collegiate Church, mainly from those restored in the first decades of the 20th century; some of those come from convents in the same territory that are no longer open.There are two bizantine eucharist veils dating back to the 13th century, a polyptych dating back to the beginning of the 15th century, the Nativity by Cristoforo Caselli, a splendid 15th century procession cross made by Bartolomeo Zucconi. There are also some oil paintings.