Famous for its colorful ceramics and gleaming cathedral, Orvieto, Umbria's grand hill town, sits majestically high above the valley floor on a big chunk of volcanic stone. The cathedral's lively façade and mass of mosaics houses the Chapel of St. Brizio — Orvieto's must-see artistic site. Inside the chapel, Luca Signorelli's frescoes of the apocalypse depict events at the end of the world and reflect the turbulent atmosphere of Italy in the late 1400s. For more information on the Rick Steves' Europe TV series — including episode descriptions, scripts, participating stations, travel information on destinations and more — visit www.ricksteves.com.