The Bear Cave in Kletno is one of the longest and deepest in Poland. To this day, the exact length of its corridors is not known, but it is estimated to be about 5 km, while its depth exceeds 100 m.
A separate tourist route for visitors is located on the middle level. It is very attractive due to its unique dripstone decoration and the presence of numerous bones of ice age animals. The exceptionally well-preserved dripstone decoration of the cave is mainly due to the accumulation of calcium carbonate in the water, which takes the form of calcite. Calcite, on the other hand, can occur in a variety of shapes. The flowstone formations include stalactites, stalagmites and their combinations, i.e. spectacular stalagmites.
The water flowing down the ceiling of the cave, which forms calcite curtains, also looks extremely beautiful. The bottom of the cave also looks equally interesting. Here we can see necrotic bowls with water, coral reef-like formations, as well as rare spherical mineral grains.
The Bear Cave in Kletno was discovered by accident in 1966. After many research works, it was opened to tourists in 1983. In 1977, the cave was granted the title of a Nature Reserve. The current tourist route is about 360 m and tours are guided. Those who wish to explore the cave more, may choose the 3-hour extreme route, which allows you to feel like a real cave explorer for a while. This route includes a descent to the bottom of the Great Rift, as well as passing through clips and narrow crevices. For this reason, it is recommended for undersized and physically fit people.