Castle in Nantes
The Chateau des Ducs de Bretagne is a 15th-century castle in the center of Nantes with a moat, ramparts, and the Nantes History Museum inside. The courtyard and rampart walk are free. The museum is paid (free on the first Sunday of the month). Budget travelers walk the ramparts for free, enjoy the views over the city, and visit the museum on a free Sunday.
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Other places worth the walk, and what each one costs.
Les Machines de l'Ile is a fantastical art project in Nantes' former shipyards, featuring a 12-meter mechanical elephant that walks and sprays water, a three-story carousel of deep-sea creatures, and a gallery of kinetic machines. The elephant ride is paid.
The Passage Pommeraye is a three-level 19th-century shopping arcade connecting two streets at different elevations, with ornate columns, statues, and a grand staircase. Free to walk through.
Working out what Nantes costs?
The whole of Nantes