Basilica di San Sebastiano
The ornate facade of this 18th-century Baroque church—a UNESCO World Heritage site—dominates Piazza del Popolo. The interior is worth a visit for its towering marble main altar, carved wooden sacristy, and numerous statuary and artworks, including some dedicated to the cult of Madonna Odigitria, traditionally venerated by the residents of the upper part of town with a music-and-flower-filled annual May procession.