If you're in the area of Bayeux already then I might "recommend" visiting the WW2 memorial where the Normandy landings were. I think it is Omaha Beach. There is quite a large exhibition and visitor centre.
Also recommend "Le Mont Saint Michel". However, it is probably best part of a 4-hr drive each way from CDG. Bear in mind that highways in France also usually require paying toll. Bon voyage!
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