Notes from an underground lake

Eerily beautiful, the Ruskeala Mountain Park is a reminder of the booming mining industry that thrived for centuries in this part of Russia, near the border with Finland. Constructed on top of an abandoned marble quarry, the park opened to the public in 2005. Its centrepiece is a centuries-old quarry that's been flooded with groundwater since the end of World War II, although some old buildings and kilns from the mines are still intact.
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