Bystrianska Cave

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.

Source: Wikipedia (CC BY-SA 4.0) — https://en.wikipedia.org/wiki/Bystrianska_Cave