Devetashka Cave

Devetashka Cave is a massive karst formation near the village of Devetaki in northern Bulgaria, measuring approximately 2 km in length with a cavernous entrance hall reaching 60 m in height and seven natural ceiling openings known as 'the eyes'. Archaeological evidence reveals nearly continuous human occupation spanning 70,000 years, from the Middle Paleolithic to the Late Neolithic. The sediment layers have yielded one of the richest sources of Neolithic cultural artifacts (6th-4th millennium BC) in Bulgaria, alongside Paleolithic flint tools, Bronze Age battle axes, and Iron Age weapons. Declared a natural landmark in 1996, the cave also shelters nearly 30,000 bats, though military use in the 1950s for petroleum storage damaged some formations.