Located near Hinterbrühl in Austria, Seegrotte is an underground cave system. This cave was earlier used as a gypsum mine and has a large grotto located underneath it. An underground lake is located here which lies 60 metres below the ground and is the largest underground lake in Europe. Visitors can tour the mine and also boat in the lake here. The ticket here costs you EUR 11 and the visitor timings can vary throughout the year.

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