Eccentrites are formed through microscopic water conduits that cause crystals to grow in chaotic, branching shapes regardless of gravity.
The cave was found when quarry blasting broke through the outer wall, revealing the hidden chamber.
The central room of the cave is so acoustically precise that it has hosted symphonic concerts in the past.
The geological composition of the surrounding area is primarily comprised of limestone and dolomite.
The cave system reaches a total length of approximately 500 meters, though only a portion is open to the public.
Pozalagua Cave is world-renowned for containing the highest concentration of eccentrite stalactites found on Earth. Unlike standard formations that grow vertically, these rare crystals grow in random, multi-directional patterns, appearing to defy gravity. The cave was discovered accidentally in 1957 due to explosions in the nearby Dolomite quarry. It is situated in the heart of the Armañón Natural Park in the province of Bizkaia. The interior features a central chamber with an amphitheater-like acoustic space created by the unique rock formations. Visitors access the site via a guided walking tour along a concrete path. The cave lighting system is designed to minimize the impact on the delicate geological structures.
The main hall, where the density of eccentrites creates the most impressive visual backdrop.
Bring a jacket, as the internal cave temperature remains constant and cool throughout the year.
Wear footwear with good grip, as the path surfaces can be damp and slippery.
Book your visit in advance via the official website, as group sizes are strictly limited.
Attempting to photograph with long-exposure equipment or tripods, which slows down the guided group tours.
Closed on Mondays throughout most of the year; generally closed during January and February for maintenance.
Touching the stalactites is strictly prohibited; flash photography is forbidden to prevent damage to the cave ecosystem.
