Nantes rewards a focused visit built around its most distinctive sights. The Château des Ducs de Bretagne anchors the historic core, its moated walls opening onto centuries of Breton history, while Les Machines de l'Île turns a former shipyard into a playground of giant mechanical creatures, headlined by the Mechanical Elephant Ride. A stroll through the Bouffay - Historic Old Town reveals half-timbered lanes and lively squares just steps from the cathedral. Add the Musée d'Arts de Nantes for a dose of fine art, and these picks cover Nantes' medieval, industrial, and artistic layers in a single walkable loop.