The Saalfeld Fairy Grottoes (in German: Saalfelder Feengrotten) are caverns or grottoes of a former mine near Saalfeld, in the German state of Thuringia. They have long been famous for their countless colorful mineral formations (speleothems) formed over many years by water dripping through relatively soft rock. Since 1993, the Guinness Book of World Records has termed the Feengrotten "the most colorful cave grottoes in the world". The caverns consist of three chambers connected by galleries. In the first chamber, information is presented about the history of the mine — in the 16th to 19th centuries an alum shale mine that was closed in 1850 but opened for sightseeing in 1914. The historical background includes information about environmental radiation treatments formerly offered there until such treatments were found to be hazardous. More information...
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