Stock Photo - A aeirial view taken using a drone, approximately 300m above sea level, shows an abandoned copper mine located near the village of Tsar Asen (King Asen) some 100 km east of the Bulgarian capital, Sofia. Many local residents in the village near the mine see it as a tourist attraction with photographers often visiting the site to capture its unique green pool of water. Where: Tsar Asen, Bulgaria When: 12 May 2015 Credit: Impact Press Group/WENN.com

Stock Photo: A aeirial view taken using a drone, approximately 300m above sea level, shows an abandoned copper mine located near the village of Tsar Asen (King Asen) some.

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