Underground mills at Col-des-Roches.
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Explore the cave at Col-des-Roches, carved out by the waters of the valley at Le Locle.
In the mid-17th century it was subject to some remarkable developments. Admire the talent of the engineers who tamed an underground waterfall and built hydraulic wheels that powered mills, rebates and saws. The cave that can be visited and the adjoining museum tell the extraordinary story of these underground mills.