Hölloch
Canton of Schwyz, Switzerland
Adventure
The Hölloch is a 211.2 km long cave in the municipality Muotathal in Switzerland. In addition to being the third longest cave in Europe and the 11th longest in the world, it is also notable for having a depth of 1,033 m.
From Wikipedia, CC BY-SA 4.0
Been here? Collect this stamp in your own passport and share it with friends.
Collect this stampI already have an account