Le Mont Saint-Michel citadel in Normandy is an UNESCO World Heritage site, impressive to behold and visit. (Photo by Duc de Salier)
4 hours total travel time from Paris to Rennes to Mont Saint-Michel (TGV + coach [bus]) gets you to the citadel. Search for TGV tickets from Paris to Mont-Saint-Michel. This will include the bus ride between Rennes & Mont Saint-Michel.
Other cities close by to visit:
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