Eisensteinhöhle, Limestone cave in Bad Fischau-Brunn, Austria.
Eisensteinhöhle is a limestone cave system extending about 2,300 meters (7,545 feet) through the rock, with depths reaching about 73 meters (240 feet). The network includes numerous passages and chambers carved out gradually by underground water erosion.
Stone quarry workers first found the cave system in autumn 1855, entering initially through a deep shaft and narrow passage. Beginning in 1907, a local hiking club undertook systematic development to make it accessible for visitors.
The name comes from a local landowner who owned the property where it was discovered. Today visitors can see how the passages were adapted for exploration and touring.
You will need to wear protective gear including a helmet, overall suit, boots, and a carbide lamp during your visit. Tours take about one hour and require moderate physical fitness to navigate the passages comfortably.
Inside, the temperature stays constant at about 13 degrees Celsius (55 degrees Fahrenheit) throughout the year due to thermal springs in the rock. This steady warmth shapes the cave's own microclimate in a distinctive way.
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