Vjetrenica Cave (Wind Cave)

Vjetrenica, which translates to "wind cave" or "blowhole", is a cave in Bosnia and Herzegovina which gets its name from the cool air that blows from the mouth of the cave in the warmer months.

The cave is 7.014 km (4.36 miles) in length, with its main channel being about 2.47 km (1.53 miles) long. It is located in the Dinaric Alps, which stretch from Northwest Italy to Albania and feature some of the most rugged landscapes in Europe. The area surrounding Vjetrenica Cave is also renowned for the Trebišnjica River, which is one of the longest sinking rivers in the world.

Vjetrenica is most famous for its incredible biodiversity - in 2024, it was recognized as a UNESCO World Heritage Site "as one of the world’s most important and species-rich biodiversity hotspots for subterranean fauna in the world" (UNESCO). More than 230 species of fauna are known to inhabit the cave, and 40 of those species were discovered for the first time in Vjetrenica. The cave is also home to the only subterranean tubeworm species in the world, as well as a large number of relict fauna - species whose closest living ancestors is long extinct.

Pre-historic animal fossils have been found in the cave and its existence has allegedly been known of since Roman times - Pliny the Elder makes a reference to the location in his 1st Century AD book Historia Naturalis.