Although the Duomo is celebrated as a triumph of 13th-century Gothic architecture, this church, built at about the same time, turned out to be an oversize, hulking brick box that never merited a finishing coat in marble, let alone a graceful facade. Named for the founder of the Dominican order, the church is now more closely associated with Saint Catherine of Siena. Just to the right of the entrance is the chapel in which she received the stigmata. On the wall is the only known contemporary portrait of the saint, made in the late 14th century by Andrea Vanni (circa 1332–1414). Farther down is the famous Cappella delle Santa Testa, the church's official shrine. Catherine, or bits and pieces of her, was literally spread all over the country—a foot is in Venice, most of her body is in Rome, and only her head (kept in a reliquary on the chapel's altar) and her right thumb are here. She was revered throughout the country long before she was officially named a patron saint of Italy in 1939. On either side of the chapel are well-known frescoes by Sodoma (aka Giovanni Antonio Bazzi, 1477–1549) of St. Catherine in Ecstasy. Don't miss the view of the Duomo and town center from the apse-side terrace.