One of the most amazing #caves in the world #Germany

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In 1993, Feengrotten was acclaimed by the Guinness Book of World Records as “the most colorful cave grottoes in the world.” The mining began around 1530, seeking for rather high-quality ore, the miners had discovered only alum. Historically, alum slate was used in a range of medicinal products, as a food preservative and in clarifying water.

By the 20th century, the Feengrotten had been largely forgotten. But in 1910, the old mine was rediscovered and explorers took note of the fantastic mineral deposits that had accumulated over the geologically short period of three centuries.