The central Piazza Garibaldi, dating from the 13th to the early 14th centuries, contains this Romanesque cathedral, with sculptures of the life of patron saint Cerbone above the door.
- Address: Via della Libertà 1, Massa Marittima, 58024
- Phone: 0566/902237
- Hours: Daily 8–noon and 3–6
- Location: Massa Marittima