Tschingelhorner-Martin's hole, Switzerland, canton Glarus, UNESCO, Tectonic arena Sardona, mountain hole, erosion, mountains, cl

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Photo credit: © Gerth Roland / Alamy / Afripics
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Keywords: arena, canton, clouds, erosion, glarus, hole, mountain, mountains, sardona, switzerland, tectonic, tschingelhorner-martin, unesco