The Ochtinská Aragonite Cave is one of only three aragonite caves discovered in the world so far. The cave is located at 642 meters above sea level, with an temperature between 7.2 and 7.8°C.[5] This stable microclimate, along with dissolved iron, manganese, and magnesium ion is the slowly dripping water, allows for the formation of the ornate aragonite formations. The oldest of these formations are between 120,000 and 130,000 years old, with younger formations being about 14,000 years old.[5]
In the so-called Milky Way Hall, the main attraction of the cave, white branches and clusters of aragonite shine like stars in the Milky Way. The cave was discovered by Martin Cangár and Jiri Prosek in 1954 and opened to the public in 1972.[5]