An Angstloch (German: [ˈaŋstˌlɔx] ⓘ, apparently "fear hole", but more probably from the Lat.
angustus "narrow" and German Loch "hole") was a small hole in the floor of medieval castles and fortresses that led to a cellar or basement room below.
The description of these basement rooms as "dungeons" stems from the romanticised castle studies of the 19th century.
Archaeological finds, by contrast, indicate the use of these basement spaces as store rooms.
For example, piles of stones have been found in such rooms that suggest they were used as a store for projectiles to be used in time of siege.