The cathedral was rebuilt in the 16th and 17th century. It has only kept its Gothic style apses. The interior has three naves separated by columns in black basalt with lavishly decorated bases and sculpted capitals. In addition, the cathedral contains several works of art including a moving wooden crucifix from the 15C, some low-reliefs by Gian Domenico Gagini, and a beautiful coffered ceiling, each beam decorated with strange winged figures.