Stock Photo - Bungee jumpers hurl themselves over the Prohodna cave entrance and tourists observe the ""The Eyes of God"" stone phenomenon near the village of Karlukovo, east of the Bulgarian capital Sofia, on Sunday, June, 21, 2015. Prohodna is most notable for the two equal-sized holes in the ceiling of its middle chamber which was formed through erosion. The two huge elongated holes in its ceiling, which let light into the cave, look just like a pair of human eyes - hence the name ""The Eyes of God"". Prohodna is the best known attraction in the Karlukovo Gorge, part of the Geological Park Iskar-Panega, one of the largest karst regions in Bulgaria. It is 365 metres long, which makes it the longest cave passage in Bulgaria. The cave has two entrances which lie opposite one another. The size of the Big Entrance of Prohodna makes it suitable for bungee jumping, and it is among the popular spots in Bulgaria for that activity. Where: Karlukovo, Bulgaria When: 21 Jun 2015 Credit: Impact Press Group/WENN.com

Stock Photo: Bungee jumpers hurl themselves over the Prohodna cave entrance and tourists observe the ""The Eyes of God"" stone phenomenon near the village of Karlukovo.

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