 The historical background includes information about environmental radiation treatments formerly offered there until such treatments were found to be hazardous.In the second chamber is found the source of the mineral-laden water that formed colorful stalagmites, stalactites and other shapes over the centuries.The third chamber contains the famed "Fairy Kingdom" ("Märchendom"), featuring a variegated grouping of deposits that, illuminated by theatrical lights and reflected in a perfectly still pool of water, is thought to resemble miniature castles and other buildings.