Located in Werfen, Austria, the Eisriesenwelt, or the “World of the Ice Giants,” is the largest ice cave on the planet.
Officially discovered by scientist Anton Posselt in 1879, the Eisriesenwelt is a winding labyrinth of limestone and ice roughly 42 km (26 miles) long. Its first kilometer is filled with frozen stalactites and wondrous, icy formations.
Prior to its official discovery and exploration, locals believed it was an entrance to Hell.
The Esriesenwelt Ice Caves are a natural formation, its strange inner landscapes the resut of both winter winds and the cave’s own circulating air, causing water from the thawing snow outside to freeze as it drips into the cave and onto its icy surfaces.