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Piusa Sand Caves
Estonia

Piusa Caves were created in 1922 as a quarry of quartz sand that was used to make glass. It was quarried underground. Besides the old mining caves there are also three man-made caves in the south from the quarry. The purpose of the caves were geological observations. Piusa caves have evolved into a popular site for hibernating bats. It is the largest known hibernation colony in Eastern Europe.

Source: VisitEstonia.com

Copyright: Andrew Bodrov
Type: Spherical
Resolution: 15000x7500
Taken: 24/08/2016
Uploaded: 27/08/2016
Updated: 19/01/2017
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Tags: cave; nature
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