A museum housing an exhibition on the history of Normandy and William the Conqueror. Lots of signage is in English as well, therefore, no one will leave uneducated about the area's past.
Wikipedia https://en.wikipedia.org/wiki/Normandy_Museum
Official Website http://musee-de-normandie.caen.fr/
Address 53 Rue de Geôle, Caen 14000, France
Coordinates 49°11'8.353" N -0°21'48.432" E