Stock Photo - 17 May 2018, Germany, Iserlohn: Operations manager Stefan Niggemann standing in the Dechen cave. The cave is celebrating the 150th years since its discovery in June. It was discovered by chance in June of 1868. Since then around 14 million visitors have explored the several million year old underground destination which is known for its unusual mix of stalagmites and stalactites and it's pre-historic zoology. Photo: Ina Fassbender/dpa. - Iserlohn/North Rhine-Westphalia/Germany

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