Prohodna Cave: Bulgaria's 'Eyes of God' and How to Visit

Bulgaria is dotted with caves, but few are as instantly recognisable as Prohodna Cave. Located in the karst landscape near the village of Karlukovo in Lovech Province, this vast cavern is best known for the two eye-shaped holes in its ceiling, which gaze down at visitors like a pair of heavenly eyes. Locals call them Oknata – ‘the eyes’ – and they have turned Prohodna into one of the country’s most photographed natural wonders.

What Makes Prohodna Cave Special

Prohodna is not a typical dark, narrow cave. It is a massive tunnel-like opening through a rock ridge, with two entrances at opposite ends. The main chamber stretches about 262 metres in length and reaches heights of up to 45 metres, making it one of the largest cave entrances in Bulgaria. Natural light streams in from both ends and, most dramatically, through the two ‘eyes’ in the ceiling. These openings were formed by the slow erosion of limestone over millennia, and when the sun is directly overhead, beams of light pour through them like spotlights.

The larger of the two eyes, known as the Big Eye, is roughly oval and about 4 metres wide. The smaller, the Little Eye, sits a few metres away. Together they create an eerie, cathedral-like atmosphere that has inspired legends and drawn filmmakers and photographers from around the world. Because the cave is easily accessible and requires no special equipment, it is a favourite stop on any road trip through northern Bulgaria.

How to Get There

Prohodna Cave is about 100 kilometres northeast of Sofia and roughly 30 kilometres southwest of the town of Lukovit. The most convenient way to reach it is by car. From Sofia, take the Hemus motorway (A2) towards Varna and exit at Yablanitsa, then follow signs for Karlukovo. The village is small but well signposted. The cave itself lies just outside the village, about a 15-minute walk from the nearest parking area along a well-trodden path.

If you are relying on public transport, you can take a train or bus to Lukovit or Karlukovo, but be prepared for a longer walk or a short taxi ride from the station. The final approach is straightforward and suitable for most fitness levels, though sturdy shoes are recommended because the ground can be uneven and slippery after rain.

What to See Inside

The main chamber is the star attraction, but there is more to explore around the site. The interior walls are pockmarked with smaller hollows and ledges, and in places you can see the smooth, sculpted forms created by centuries of water flow. Because the cave is so large and open, it never feels claustrophobic. On sunny days, the play of light and shadow is constantly changing, especially in the late morning when the eyes are most clearly defined.

Beyond the cave itself, the surrounding Karlukovo karst region is a paradise for walkers. There are several marked trails that lead to other caves, rock arches and viewpoints over the Iskar River gorge. One popular route connects Prohodna with the nearby Devetashka Cave, though that is a longer excursion best done with a full day set aside. The entire area is quiet and largely undiscovered by international tourists, so you may have the landscape almost to yourself outside peak summer weekends.

Practical Tips for Your Visit

Because Prohodna is a natural site with no entrance fee or fixed opening hours, you can visit at any time. However, daylight hours are obviously best for seeing the eyes. Spring and autumn offer the most comfortable temperatures for walking, while summer can be hot in the open areas around the cave. If you visit in winter, be aware that the path can be icy.

There are no facilities at the cave itself, so bring water and snacks if you plan to stay for a while. The nearest shops and restaurants are in Lukovit or Karlukovo. Wear comfortable walking shoes and a light jacket even in summer, as the cave interior is noticeably cooler than the outside air. And of course, bring a camera – the eyes make for an unforgettable photo, especially when you stand directly beneath them and look up.

For anyone seeking a low-key natural wonder away from the busy Black Sea coast or the crowded ski resorts, Prohodna Cave is a perfect half-day outing that combines easy access with a genuinely dramatic landscape.