Just 5 km from Palermo, owes its importance to the cathedral masterpiece of Norman, built in 1174 by order of King William II the Good, and the result of different artistic traditions Roman, Byzantine and Arabic. The architectural complex includes the church, monastery and royal palace. The facade of the cathedral is built of tuff and lava, and opens with a front porch with three columns above the bronze doors in the Roman style that bear engravings on biblical episodes, above the columns a balustrade and two towers on either side. The interior of the church is majestically decorated with mosaics of gold, symbolizing light and depicting stories from the Old and New Testament with the dominant image of Christ Pantocrator. Of great importance also the tombs of the real William with his wife and sons, William II, the largest organ in the six keyboards, the chapels of St. Benedict and St. Castrense and the treasure of the cathedral. Of great importance also is part of the cloister convent, square-shaped with a double row of columns that alternate with smooth carved pillars, in a corner, a fountain with a column which is also inlaid from which the water flows.