 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.In 1913 the third chamber with the "Fairy Kingdom" was discovered, and shortly before the outbreak of World War I in 1914 tours began to be offered to the public.At that time a pavilion with café was opened that remained in use in the following decades — including the post-World War II German Democratic Republic, which categorized the "Feengrotten" as an official "Sehenswürdigkeit" (point of Interest) of the GDR, open to foreign tourists.