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europe glass historical industry made man material mine mining sand sandstone sightseeing stairway tourism travel undergroundSandstone Caves In Estonia. Stock Photo
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Title
Sandstone caves in Estonia. #79283136
Description
Sandstone caves ("Piusa caves") in Estonia. Originally was a glass sand mine supplying local glass industry with raw material. Some of the caves are 10 metres high. Length of tunnels about 10 km. In winter huge bat colonies hibernate in deeper caves.
