At the north end of the main piazza rises the Duomo's facade, which ran the stylistic gamut from Romanesque through the Renaissance but still came out blessedly simple in the end. Inside on the entrance wall, framing a gorgeous rose window, is a Last Judgment frescoed by Ferraù di Faenza in 1596 that owes about 80% of its figures and design directly to Michelangelo's Last Judgment in Rome's Sistine Chapel. Art critics tend to hate it, but it's stunning nevertheless, and the highlight of the cathedral. In the right aisle, under the sprightly thin-columned Gothic arcade added in the 1300s, are a 1507 marble font, what's left of a Trinity (1525) by Lo Spagna (here he's cribbing from Masaccio), and an early-16th-century tempera altarpiece by Giannicola di Paolo. To see the crypt and tiny Museo di Lapidario (which contains a small collection of Roman and Etruscan remains and medieval statuary), you must pay 1€.