The Quackenschloss is a passage cave about 18 meters long. It is the remains of a very old and high-lying cave system. The rock wall has a patchy appearance due to the weathering of individual shells. The cave probably gets its name from this rock composition. The type of stone with holes in it (smokewacke) is called quacke here.
The oblique oval shape of the cave is determined by two longitudinal fissures and two diagonally sloping bank joints. Two larger fissures cross the passage. One portal is about 7 meters wide and 2.5 meters high, the other, divided by a rock pillar, is about 9 meters wide and 5 meters high.
The cave is registered as C 4 in the Franconian Alb Cave Register (HFA). It has been designated by the Bavarian State Office for the Environment as an important geotope (474R060)[1] and as a natural monument (ND-04580).
The cave, which is easily accessible via hiking trails, is one of the most frequently visited destinations in the Franconian Jura, also because of its scenic location. There is a sport climbing area next to the cave.
Source: Wikipedia