Château de Cheverny

Cheverny is both totes adorbs, and still owned by the same family for, like, 5 centuries. It was famously one of the first private castles to be open to the public about 100 years ago.

Also this castle is the inspiration for the one in Tintin, the Franco-Belgian comic book (Moulinsart in the original, Marlinspike in English). The gift shop leans really hard on the Tintin merch.