Bystrianska Cave is a limestone cave located on the southern slopes of the Nizke Tatry Mountains, along the road towards Banska Bystrica, at the southern edge of the town of Bystrá, in the Brezno District, Banskobystrický region, in Slovakia. Discovered in 1926 by E. and A. Hollmann and J. Kovalčík, the cave is 2637 m in length and 95 m in depth. About 490 m of the cave has been made public in 1968.
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The cave consists primarily of dark limestone rocks formed in tectonic cracks by water corrosion and gradually enlarged by the underground river Bystra. The lower entrance to the cave was opened in 1932. The precipice Peklo, through which the access to a new cave was found, was discovered in 1926.[1] The Old and New Cave were connected by J. Majko and J. Vytřísalová together with their colleagues in 1955. In 1951 the Mostárenské Halls were discovered.
The Bystrianska Cave is considered to be the most important cave of the Upper Hron River Valley. The Lower Guerilla Hall and some other parts of the cave have been used for speleotherapy since 1971.