Château de Chaumont-sur-Loire
Not only is this a beautiful château but is has an incredible view of Loire Valley. Besides the chateau which often houses an art exhibit on its top floor, there are multiple gardens on the grounds that are gorgeous. There is a garden festival every year in this spot.
I am a personal fan of the history of this château and Château de Chenonceau (another wonderful spot) and the rivalry between
Catherine de Medici and Diane de Poitiers. When Catherine's husband Henry II, died she forced his mistress Diane to exchange châteaus! But as both places are quite beautiful I am not sure who got the raw end of the stick!