Teufelsloch, Natural cave in Timmenrode, Germany.

Teufelsloch is a natural cave forming part of the Teufelsmauer rock formation in Saxony-Anhalt, characterized by distinctive sandstone structures. The cave sits within a larger rock massif that displays striking geological features across the landscape.

The cave may have originated from the quarrying of scouring sand, and its large oval entrance leads to a north-facing opening in the rock whose origin is unclear and may stem from a ceiling or wall collapse. The northern opening is explained in the legend "Der Kuhstall an den Zinnen", in which the shepherd Ulrich is trapped with his herd by the devil until the bulls break through the rock. In 2016 the cave served as a filming location for the German fairy-tale film "Das singende, klingende Bäumchen".

The cave's name comes from the legend "Der Kuhstall an den Zinnen": a shepherd named Ulrich was herding cattle at the Helsunger Bruch when a summer storm struck. A small man led him and his herd into the cave, then turned into the devil and rolled a stone across the entrance. The bulls charged the rock until the north wall broke open, creating today's window-like opening.

Access is via a marked hiking trail of about 7 kilometers starting from the Schnappelberg parking lot in Blankenburg, near the historic castle. Bring weather-appropriate clothing and sturdy footwear since the path crosses varied terrain.

The large north-facing opening resembles a panoramic window; its origin is unclear and may stem from a ceiling or wall collapse. The cave is also known as Kuhstall, and in 2016 it served as a filming location for the German fairy-tale film Das singende, klingende Bäumchen.