Moulins souterrains du Col-des-Roches, Underground watermill and technology museum in Le Locle, Switzerland.
The Moulins souterrains du Col-des-Roches are underground mills carved into a mountain near Le Locle that used flowing water to grind grain. The system spans multiple levels with channels, shafts, and wheels cut directly from the limestone bedrock.
These underground mills emerged in the 17th century when local millers tapped mountain water sources to process grain. They operated continuously until 1884, supplying flour to surrounding villages throughout this period.
The site shows how local people harnessed water power to support their everyday work and livelihoods. The channels and wheels still tell the story of this craft tradition that shaped community life.
Access is by guided tour available from March through November. Wear comfortable shoes and be prepared for stairs and damp conditions underground.
Visitors can watch faithful reconstructions actually function and process grain as the machinery grinds. This working demonstration shows firsthand how the work happened over a century ago.
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