Syeva Dupka is one of Bulgaria's most beautiful caves, tucked away in the Central Fore-Balkan and famous for its striking colors of green, brown and white plus a massive stalactite column measuring 60 meters in circumference. Formed over roughly three million years, this underground world is named after two shepherd brothers who once used it as a hideout during Ottoman rule.

The cave stretches 205 meters and contains five chambers connected by passages, with an underground river flowing 70 meters below the surface. Temperatures stay steady at 7-11°C with humidity between 90-98%, so bring a warm layer even in summer. Inside you'll find stalactites, stalagmites, stalagnates, and rare helictites resembling coral branches. One chamber, nicknamed the Concert Hall for its remarkable acoustics, has even hosted performances by well-known Bulgarian singers.

How to get there

• Brestnitsa village — the cave lies about 3 km south of the village, accessible by local road, easy walk
• Yablanitsa town — around 10 km from the cave
• Teteven town — around 25 km from the cave

Practical information

• The cave has been electrified and developed for tourism since 1967
• Managed by the Bulgarian Tourist Union
• Home to eight bat species, six of which are priority species for conservation in Europe
• Listed among Bulgaria's 100 National Tourist Sites

During restoration work, archaeologists found animal bones, clay vessels and coins dating back to the era of Roman emperor Antoninus - proof that people have been drawn to this cave for centuries.