Pierre de Montfaucon built the Château de Saint-Mesmin around 1370. In the Middle Ages, the castle was surrounded by water moats. The Montfaucon family fortified the castle by adding the imposing keep crowned with a walkway. It is then accessed by a drawbridge.
This castle was besieged only once in the Middle Ages. Later it was besieged during the French Revolution in 1796. Today Château de Saint-Mesmin is open to the public.
Saint-Georges de Boscherville Abbey is a former Benedictine abbey. It was founded in about 1113 by Guillaume de Tancarville on the site of an earlier establishment of secular canons and settled by monks from the Abbey of Saint-Evroul. The abbey church made of Caumont stone was erected from 1113 to 1140. The Norman builders aimed to have very well-lit naves and they did this by means of tall, large windows, initially made possible by a wooden ceiling, which prevented uplift, although this was replaced by a Gothic vault in the 13th century. The chapter room was built after the abbey church and dates from the last quarter of the 12th century.
The arrival of the Maurist monks in 1659, after the disasters of the Wars of Religion, helped to get the abbey back on a firmer spiritual, architectural and economic footing. They erected a large monastic building one wing of which fitted tightly around the chapter house (which was otherwise left as it was).