Just beneath the ground in the Piusa Sand Caves, is a massive group of hibernating bats. Having made their home in the man-made passages since the 1950s, the size of this protected bat house has swelled to become the largest bat colony in all of the Baltic States.Beginning in 1922, miners began to hollow out the area that is now the Piusa Caves. Excavating for glass-sand, miners carefully hollowed out the sandstone into long corridors, open galleries and surprisingly elegant vaulted ceilings. Starkly different from other mines that are blasted apart or simply hacked to death, the Piusa Caves almost seem like a planned underground development.
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