Čertova pec

Čertova pec (English: Devil's furnace) is a small karst cave in the Považský Inovec mountains of Slovakia. It is located near Radošina, in the Nitra Region. As well as being a modern recreational site, the cave is known to have yielded material evidence of repeated human presence and habitation during the Stone Age.

Source: Wikipedia (CC BY-SA 4.0) — https://en.wikipedia.org/wiki/%C4%8Certova_pec