Stock Photo - 05 October 2018, Lower Saxony, Herzberg: The entrance to the walk-in unicorn cave in the Harz Mountains. The cave is the largest visitor cave in the western part of the Harz Mountains. The special: A hole in the ceiling of the cave - the blue grotto - allows the rising humidity of 90 percent to evaporate. This evaporation cooling lets the thermometer sink again - to a crisp 5 degrees. Photo: Swen Pförtner/dpa. - Herzberg/Lower Saxony/Germany

Stock Photo: 05 October 2018, Lower Saxony, Herzberg: The entrance to the walk-in unicorn cave in the Harz Mountains. The cave is the largest visitor cave in the western.

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