It’s located in the centre, on Piazza Duomo, so we sometimes passed it, but it was closed. (Open:9-12, 16-19). On our third day we were happy to go inside. Originally it was built in Roman style, but in 13. century it was rebuilt in Gothic Catalan-Aragon style and it got a white limestone facade in Spanish Baroque style in 18. century. I think it’s ornate and elegant interior, a must see attraction.