Underground mills at Col-des-Roches.
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More than 400 years old, the mills of Col-des-Roches are underground.
Dugged by the waters of the valley of Locle, the cave of Col-des-Roches was the object, in the middle of the XVIIe century, remarkable facilities. Admire the talent of the engineers who tamed an underground waterfall and built hydraulic wheels that powered mills, rebats and saws. The cave that can be visited and the adjoining museum tell the extraordinary story of these underground mills.