Jardin Extraordinaire turns a former quarry on Nantes's western side into a steep, theatrical garden of paths, planting, cliffs, and water. It feels different from the formal Jardin des Plantes: rougher, more vertical, and more connected to the city's industrial and river landscapes.
It is a good choice if you have already seen the central sights and want Nantes's newer public-space imagination. Combine it with the Loire-side walk or the Machines de l'Île area for a day that shows how the city keeps reusing awkward places well.