Devetashka Cave, Bulgaria http://pic.twitter.com/b6pXK8kd4U
— Earth Pics (@ThatsEarth) February 28, 2016
via Twitter https://twitter.com/ThatsEarth
February 28, 2016 at 03:12PM
Devetashka Cave, Bulgaria http://pic.twitter.com/b6pXK8kd4U
— Earth Pics (@ThatsEarth) February 28, 2016
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