The two symmetrical ceiling openings are naturally positioned to resemble human eyes, creating a unique lighting effect on the cave floor.
The cave is part of the Karlukovo Gorge karst region, which contains hundreds of smaller caves and vertical shafts.
Due to its acoustics and dramatic lighting, the site is frequently used as a filming location for international and Bulgarian cinema.
The cave floor is relatively flat and lacks the typical stalactite and stalagmite formations found in deeper, enclosed caves.
The name 'Prohodna' translates to 'passageway,' referencing its function as a natural tunnel through the limestone ridge.
Prohodna Cave is a 262-meter long karst tunnel located near the village of Karlukovo in the Iskar Gorge. The cave is defined by two vertical openings in its ceiling, known as the 'Eyes of God,' which allow natural light to illuminate the cavern floor. The geological formation is a result of karst erosion that created a natural bridge-like structure. The cave serves as an important site for both speleological study and cultural tourism. Visitors traverse the entire length of the cave via an accessible walking path. The karst environment remains naturally cool throughout the year.
Position yourself in the center of the cave, directly beneath the two 'eyes,' to capture the symmetry of the light apertures.
Bring a reliable flashlight for darker sections near the cave center.
Wear sturdy, non-slip footwear as the ground can be uneven and moist.
Check the weather forecast, as rain can make the entrance areas muddy and slippery.
Attempting to enter the cave during heavy rain or storm conditions when falling debris from the openings may pose a risk.
Do not climb on the cave walls, do not leave trash, and remain on the marked paths to protect the fragile karst ecosystem.
