The village of Holštejn is located in the northeast of the Moravian Karst protected landscape area. Many centuries ago, a mediaeval castle stood on a limestone cliff a little way from Holštejn. Its name was derived from the German “Höhl Stein” (a hollow rock or stone), since the Hladomorna (Dungeon) Cave, which served as a castle prison, can be found beneath the castle. An access tunnel 14 metres long led to the castle. The cave itself is 17 metres high and 25 x 35 metres in size. The cave floor is covered in a great many rocks which have fallen from the ceiling, and a great many human remains, as well as armour, spurs and other metal objects, have been found in the earth between them. Holštejn Castle was, for a time, held by robber knights who threw their victims into the cave through an opening in the roof. The Dungeon is today reached through an opening made at the foot of the cliff.