Moulins souterrains du Col-des-Roches

The Moulins souterrains du Col-des-Roches (Underground Mills of Col-des-Roches) is a unique underground mill museum in Le Locle, Switzerland, featuring a natural torrent that powers historic water-driven machinery within a network of underground caves. The site also houses the Museum of the History of Le Locle, with exhibits on hydraulics and local heritage, and offers audioguides in French, German, Italian, and English.