Hirlatzhöhle, Natural monument cave in Hallstatt, Austria.
The Hirlatzhöhle is a natural monument cave located within the Dachstein mountains near Hallstatt, featuring an extensive underground passage system. The cave network ranks among Austria's largest explored cave systems.
The cave system was first systematically explored in 1949 when researchers began documenting its underground passages. Since then, it has become the focus of ongoing scientific study and investigation.
The Hallstatt-Obertraun Caving Association manages this protected site, which lies within the UNESCO World Heritage region of Hallstatt-Dachstein.
Access requires special permission since the entrance remains locked year-round for protection. Visitors must contact the local caving association well in advance to arrange any visit.
The cave features multiple entrances scattered across the landscape, with three of them accessible only by passing through underwater tunnels. These submerged passages create a complex maze beneath the mountain surface.
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