This quirky city on the banks of the Loire is full of unmissables: the fanciful Machines de l’île theme park; the eclectic boutiques at the Passage Pommeraye; the storybook Château des ducs de Bretagne, complete with a moat. For more châteaux, take a jaunt to the Loire Valley, the land of fairy-tale castles, historic towns and idyllic vineyards.