The Cattedrale di Santa Maria Assunta sits on the small Piazza San Giovanni just behind the Piazza dei Priori, consecrated in 1120 and reworked across several centuries. The plain Pisan-Romanesque facade gives little away; inside, the dim aisles open onto a coffered 16th-century gilt-and-blue ceiling that surprises every visitor walking in from the bright square.
The standout pieces are the 13th-century pulpit, reassembled from earlier carved fragments; the Deposition — a polychrome wooden group from around 1228, one of the most powerful surviving Romanesque sculptures in Italy; and a small chapel of late 14th-century terracotta nativity figures by the workshop of Andrea della Robbia.