Most visitors head to this cathedral with the carved oxen on its facade. Having escaped World War I unharmed, it inhabits the spot where an ancient basilica stood until it burned in 1111. The structure has six towers, four of which are complete. Inside are stained-glass panels dating from the 13th century, and an 18th-century choir grille. Tours (available in French only) are conducted from Easter to October on Saturday and Sunday at 3pm (arrange through the tourist office).