1) Mining museum in Austria
Found on
https://www.crosswordclues.com/clue/seegrotte
The Seegrotte, near Hinterbrühl, Austria, is an underground cave system with a large grotto located under a former gypsum mine. It was closed in 1912 after the mine flooded with 20 million liters of water. It became a tourist attraction after 1930 and has been one ever since, with the exception of World War II. The lake is 60 meters below ground,...
Found on
http://en.wikipedia.org/wiki/Seegrotte
No exact match found.
