Bear Cave - the longest cave entire Sudetenland, situated on Sněžník massif near the village Kletno. Bear cave was discovered in 1966 during work on the extraction of marble. After a surprising discovery in the cave were found numerous bones of prehistoric mammals, including the remains of a cave bear, after whom it was named. In 1967, the Institute of Geography of the University of Wrocław has developed a research plan of the cave. In the summer of 1967 carried out paleontological excavations. December 4 a group of cavers from the Academic Tourist Club led by Dr. Marianne Poulin dug a corridor leading to the further passages of the cave, rich in unique sinters and alluvium.

In the years 1968-1969 was carried out further investigation, during which opened the so-called "Floor Wroclaw" badly damaged by water. After this finding, the total length of the corridors has increased by about 800 meters, and the difference in the levels reached 50 meters.

In December 2011, at the bottom of the cave were found new corridors. The study began in April 2012, it was found about 150 meters moves. In early May, it was made another excellent opening. After going through a very narrow corridor it was found a huge room length of about 100 meters, a width of about 40 meters.

The total length of the open arms is more than 2, 5 kilometers. Rooms and corridors are located at three different levels. The lower level is the longest and beautiful, but closed to tourists because of the high level of complexity and security conditions. Mid - is that part of the Bear cave, which is seen by tourists. The upper level is preserved only in fragments. The greatest diversity of sag can be seen today in the Castle Hall and corridor of stalactites.