Chartres, France. I've been there, and still think the cathedral is among the most amazing I've seen.
Château de La Roche Courbon, France ~ known as the Sleeping Beauty's Castle, it is a elegant château with beautiful French gardens that pre-date those at Versailles. In the Charente-Maritime, the château was originally built during the 15th century, but its current style is down to Jean-Louis de Courbon who transformed it during the 17th century. It was abandoned during Napoleon's era until it was found by Pierre Loti who appealed to collect money to save it. It is privately owned now