This big and austere Gothic barn, at the highest point in town, reveals some nice surprises once you step inside the coldly stark interior. First to catch your eye will be the stained-glass windows by Guillaume de Marcillat (1470–1529), a French master summoned to Rome to work for the popes, who spent the last 10 years of his life in Arezzo creating these seven magnificent windows. His colorful scenes include the Calling of St. Matthew, the Baptism of Christ, the Expulsion of Merchants from the Temple, the Adulteress, and the Raising of Lazarus along the right wall; and Saints Silvester and Lucy in the chapel to the left of the apse. (Lucy has a amazingly serene face, considering that she’s about to have her eyes gouged out.) Beneath these colorful tableaux are some other fine works: a robust Mary Magdalene portrayed in a fresco by Piero Della Francesca in an arch near the sacristy door; the stone-carved battle scenes on the tomb of Guido Tarlati, an Aretine bishop who died in 1327; and in the chapel on the left near the entrance, a series of terra-cottas by della Robbia showing the Assumption, the Crucifixion, and a Madonna and Child.