This amazing underground complex was built in the 17th century: two flour mills, a saw mill and maze-like passages.
Official Website http://www.lesmoulins.ch/
Email col-des-roches@lesmoulins.ch
Phone +41 32 889 68 92
Address Le Col 23, 2400 Le Locle, Switzerland
Coordinates 47°2'56.294" N 6°43'16.82" E