Abbey of Saint-Etienne should be on the must-see list of any history buff. Inquire about tours or simply admire the exterior of this striking structure from out front.
You're spoiled for sightseeing choice when staying in Caen City Centre. Abbey of Saint-Etienne is a good place to start here, but there are numerous other worthy places to appreciate. Festyland, Caen Memorial, and Zenith de Caen are not far from the historic landmark and and will cap off your day nicely.