Bear's cave – the longest cave throughout the Sudetenland, located in the snieznik massif near the village of Kletno. The bear cave was discovered in 1966 during the work on the extraction of marble. After a surprising discovery in the cave were found many bones of prehistoric mammals, including the remains of a cave bear, after whom it was named. In 1967 the Institute of geography, University of Wroclaw has developed a research plan of the cave. In the summer of 1967 was conducted paleontological excavations. December 4, a group of speleologists of the Academic tourist club under the direction of Dr. Marianne Polini dug a corridor leading to a further cave passages, rich in unique sinters and reclamation.

In the years 1968-1969 further study, which opened the so-called "Floor Wroclaw", badly damaged from water. After this find the total length of the corridors has increased by about 800 meters, and the difference in the levels reached in 50 metres.

In December 2011, in the lower part of the cave were found the new corridors. The study began in April 2012, it was discovered okolo meters of moves. In early may was made another great discovery. After passing through a very narrow corridor was discovered a huge hall with a length of about 100 meters, a width of about 40 meters.

The total length of open corridors is more than 2. 5 km. Halls and corridors are located on three different levels. The lower level is the longest and beautiful, but closed to tourists due to high level of complexity and security conditions. Intermediate level – this is the part of the Bear's cave, which the tourists see. The upper level is preserved only in fragments. The greatest diversity of forms incrustations can be seen today in the Castle Hall and the Corridor of Stalactites.