Eastern Europe - Bulgaria - България - Geological Park Iskar-Panega - Prohodna Cave - Пещера Проходна - Spectacular karst cave located in Iskar Gorge, known for two eye-like holes in its ceiling, known as Oknata - The windows or Eyes of God formation - Prohodna cave is 262 metres (860 ft) long, which makes it the longest cave passage in Bulgaria - Cave has two entrances which lie opposite one another and the cave owes its name to this fact, which literally means Thoroughfare Cave or Passage Cave

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Keywords: Bulgaria, Bulgarian, България, Balgariya, Republic of Bulgaria, Република България, Republika Balgariya, Bulharsko, Bulgarie, Balkans, Balkan, Southeast Europe, Europe, European Union, EU, wonderful, fantastic, awesome, stunning, beautiful, breathtaking, incredible, lovely, nice, best, perfect, world, exploration, trip, vacation, holiday, place, destination, location, journey, tour, touring, tourism, tourist, travel, traveling, vacation, visit, visiting, sight, sightseeing

Camera Model: Canon EOS 5DS; Lens: EF16-35mm f/4L IS USM; Focal length: 16.00 mm; Aperture: 5.6; Exposure time: 1/50 s; ISO: 400

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