Luegsteinhöhle, Cave castle in Oberaudorf, Germany.

Luegsteinhöhle, also called Grafenloch, is a high medieval cave castle in the Luegsteinwand at 640 m above sea level, above the Luegsteinsee near Mühlbach. Its 19.5 m deep cave interior lies behind an entrance set four metres up the rock, reached by ladder; remnants of the gate arch survive. Inside, traces point to a two-storey timber fitting and a heatable plank room, separated from outside by a one-metre-thick mantle wall on a massive supporting wall.

The cave castle was probably built in the 11th century by knights who were vassals or ministerials of the Counts of Falkenstein, and it is considered a predecessor of the Auerburg. Ceramic finds point to use from the 11th to the 13th century, with the castle abandoned around 1250. Excavations in 2008 disproved the earlier assumption of a refuge castle from the Thirty Years' War.

The site is also called Grafenloch, the counts' hole, linking it to the Counts of Falkenstein, who held the region in the High Middle Ages. A local legend tells of a Roma woman who foretold the Auer count's death by lightning; he is said to have died during a sudden storm while failing to reach the steep ladder into the cave. The path over the cave castle is part of the Audorfer Höhlenweg.

The cave entrance sits four metres above the ground and is reached only by ladder; the interior drops 19.5 metres. The approach lies in the Luegsteinwand above the Luegsteinsee and forms part of the Audorfer Höhlenweg trail. The site is at 640 metres above sea level, so wear sturdy footwear and expect a steep, exposed climb.

The legend concerns the Auer count who rose to power after murdering his parents: a Romani woman foretold he would die by lightning. After a bolt struck the castle tower, he fled into the cave, but died in a sudden storm before he could climb the steep ladder to the cave castle.