Sibyllenloch, Cave entrance in the Teckberg below Teck Castle, Kirchheim unter Teck, Germany

The Sibyllenloch is a cave in the limestone rock of the Teckberg, below the viewing tower of Teck Castle near Kirchheim unter Teck. A narrow path branches off to the right just before the castle gate and leads to the cave entrance; past the cave it continues as a steeper route up to the castle. A second cave of the same name lies in the Kirnbachtal near Ebersbach an der Fils.

Excavations at the cave in the late 19th century brought up numerous Ice Age animal skeletons, estimated at 15,000 to 20,000 years old. Bones of cave bears, cave lions, mammoth, rhinoceroses and wild horses helped researchers understand the history of the Swabian Alb. The 20th-century legend of the Sibylle and her three sons, who built castles on the Rauber, Diepoldsburg and Wielandstein, is tied to the cave.

The name comes from a 20th-century legend of the Sibylle, a wise woman who lived in a castle deep in the cave, foretold the future and gave away gold and jewels to the poor. Her three sons built castles at Rauber, Diepoldsburg and Wielandstein and robbed peasants and merchants, so she left in a fiery wagon drawn by two wildcats.

The cave lies on the Teckberg below the Teck castle viewing tower. Just before the castle gate a narrow path branches off to the right to the entrance; the same path continues past the cave as a much steeper route up to the castle.

Excavations as early as the late 19th century brought up numerous Ice Age animal skeletons, estimated at 15,000 to 20,000 years old. Bones of cave bears, cave lions, mammoth, rhinoceroses and wild horses from the cave helped researchers understand the history of the Swabian Alb.