Nidlenloch, Limestone cave in Weissenstein, Switzerland.
The Nidlenloch cave system extends through 7.5 kilometers of passages and reaches a depth of 418 meters within the Weissenstein mountain range.
First documented in 1828 by Franz Josef Hugi, the cave achieved recognition as the deepest known cave in 1909, reaching 396 meters below surface.
The name Nidlenloch refers to white limescale formations called Mondmilch, found within the cave passages and galleries of this natural formation.
Visitors need to bring their own lights and pay entrance fees at Restaurant Hinterweissenstein, with guided tours available from Wednesday through Sunday.
The cave system contains horizontal networks of galleries and fossil phreatic passages, formed by glacial meltwater over approximately one million years.
Location: Solothurn
GPS coordinates: 47.25167,7.48444
Latest update: March 2, 2025 23:29
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