Nidlenloch, Limestone cave in Weissenstein, Switzerland.
Nidlenloch is a limestone cave system in the Weissenstein mountain with more than 7 kilometers of interconnected passages that descend over 400 meters below the surface. The network consists of horizontal galleries and older passages shaped by flowing water over geological time.
The cave was first documented in 1828 and became recognized in 1909 as one of the deepest known caves at that time. This discovery made it an important location for cave exploration and scientific study in Europe.
The name Nidlenloch refers to a whitish mineral deposit called Mondmilch that coats the cave walls throughout the passages. This natural formation gives the interior its distinctive pale appearance and draws the attention of those walking through the galleries.
Visitors must bring their own lighting since the passages are completely dark with no artificial illumination throughout the system. Guided tours are offered on certain days, so it is advisable to check availability in advance and consider making a reservation.
The cave was shaped by glacial meltwater over approximately one million years, making it a remarkable record of ice age geology. This slow formation explains the complex structure with multiple levels and interconnected spaces at different depths.
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