With its glistening cluster of emerald-green, ceramic-tiled domes, the cathedral is an imposing sight. Originally dating to the 11th century, it was completely rebuilt in baroque style in the 17th century. Over the portal is a 16th-century relief of Count Roger trampling a Saracen. Inside, you'll find a heavily ornamented altar featuring the Transfiguration, surrounded by a bevy of statues by Domenico and Antonello Gagini, and stucco work by Antonio Ferraro. In the chapel to the right of the altar is a rare 13th-century painted cross.