One of Europe''s largest underground lake, tourist attraction in Austria, is known as the underground kingdom of fairy tales. Located in the west of Vienna hunter cloth dragon village, covers an area of 6200 square meters. From the underground lake is higher by a more than a man about 450 meter long tunnel. Today''s underground lake, early is a gypsum mines. In 1912, the mine mining blasting in deep fry out a stream of spring, almost everything under the flooded mine.