Château de Guillaume le Conquérant

Looming above the centre of the city and surrounded by a dry moat and massive battlements, the castle was established by William the Conqueror, Duke of Normandy, in 1060 and extended by his son Henry I. Visitors can walk around the ramparts, and visit the 12th-century Église St-Georges (open during temporary exhibitions) and the Échiquier (Exchequer), which dates from about 1100 and is one of the oldest civic buildings in Normandy. The Jardin des Simples is a garden of medicinal and aromatic herbs cultivated during the Middle Ages – some of them poisonous.

Near the château are two of the only prewar buildings left in the city centre: the half-timbered, 16th-century Musée de la Poste and the 15th-century Maison des Quatrans