![Retreating-drone-shot-of-the-wide-opening-of-Prohodna-Cave,-the-picturesque-view-of-the-mountains-and-woodlands-in-the-background,-located-in-Karlukovo,-in-Bulgaria](https://v7.cdnpk.net/videvo_files/video/partners2159/thumbnails/BB_5ab8e2e0-35fc-4a90-8eaf-472cd4e613a5_small.jpg)
Retreating drone shot of the wide opening of Prohodna Cave, the picturesque view of the mountains and woodlands in the background, located in Karlukovo, in Bulgaria
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