There is a chapel on the ground floor containing elaborate tomb slabs. The first floor houses paintings, sculpture and liturgical objects from the Collegiata and a small collection of local Etruscan treasures. A marble bust (1493), by Benedetto da Maiano, commemorates the life of scholar Onofrio di Pietro. A Collegiata Piazza del Duomo. Open daily. The plain facade of this 12th-century Romanesque church belies its exotic interior; it is one of the most frescoed churches in Italy. The arches bordering the central aisle are painted in striking blue and white stripes, and the deep blue paint of the vaulted roof is speckled with gold stars. The aisle walls are extensively covered with dramatic fresco cycles of scenes from the Bible. In the north aisle the frescoes are on three levels and comprise 26 episodes The ceiling of the Collegiata, painted with gold stars from the Old Testament, including The Creation of Adam and Eve, Noah and his Ark, Moses Crossing the Red Sea and The Afflictions of Job, finished by Bartolo di Fredi in 1367.