Cattedrale di Palermo
This church is a lesson in Palermitano eclecticism—originally Norman (1182), then Catalan Gothic (14th to 15th century), then fitted out with a Baroque and neoclassical interior (18th century). Its turrets, towers, dome, and arches come together in the kind of meeting of diverse elements that King Roger II (1095–1154), whose tomb is inside along with that of Frederick II, fostered during his reign. The exterior is more intriguing than the interior, and it's worth walking round to the gracefully decorated back of the apse to view the interlacing Arab arches inlaid with limestone and black volcanic tufa. The climb to the cathedral's roof is also recommended for some fabulous city views.