Situated in the Bystra -Valaska Karst of the Upper Hron River Valley, at the southern border of Bystra village, on the southern slopes of the Low Tatras. It was formed in Middle Triassic limestones  by ponor waters of Bystrianka stream. It consists of the Old and the New Cave, about 1,000 m in length. Shapes of river modelling  and draperies, hanging locally from the edges of sinter crusts created on the former river sediments which were later floated by the river, are attractive for visitors.

Opening to the Old Cave was known to the locals since the ancient times. Farther spaces were discovered in 1923.

The precipice Peklo, through which the access to the New Cave was found later, was discovered in 1926. A part of the cave was open to the public in 1934 and 1940. The current 490 m of cave spaces have been made public in 1968. It has been serving for speleotherapeutic procedures since 1971.

Lenght of pathway: 490 m Duration of the guided tour: 45 min. Open for the public: 2.1.-31.10. Average temperature: 5,7 – 6,7°C