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Baar, Switzerland

Hell Grottoes

These spooky and unusual stone formations create an underworldly landscape. 

The aptly named Hell-Grottoes consist of twisted, tangled stone formations and murky subterranean lakes that take hours to fully explore.

The Swiss location has become such a legendary draw, the caves are lit with eery lights and adorned with safe footpaths to make it safe and appealing for visitors. As a result, these strange and fascinating caverns have become something of a tourist attraction, with tours and guides readily available.