I hope that I can inspire you to go, if you didn?t before, to Abbaye aux Hommes in Caen to see what's left of King William I of England (aka William the Conqueror). The story of his entombment there is so undignified. It involved the funeral procession catching fire! Then various factions squabbling over the rotting, smoking corpse. It now holds only what?s left, which I think is just a charred thighbone.
Caen's not a big draw even though it's got the Abbey and the Castle.
The castle was built by William the Conqueror in around 1060. It is majestically preserved. It's where you'll find the Mus?e des Beaux-Arts, with one of the premier collections of European art. If you missed that before, then please put it on your list.