Castle ruin can be visited
Monsberg Castle

The Monsberg ruin, also called Munt's Castle, is the ruin of a spur castle above the St. Ruprecht ruin on a 591.4 m above sea level rock spur above the Lauter southwest of the Erbstetten district of the city of Ehingen in the Alb-Donau district in Baden-Württemberg.
History+
Of the castle built in the 13th century by the Lords of Monsberg, a "Ulricus de Mundisberc" is mentioned in 1258. On April 21, 1379, the castle with all its accessories was sold by Count Konrad von Aichelberg to Hans vom Stein zu Klingenstein, and from 1405 to 1411 all Monsberg possessions went to Zwiefalten Monastery. In July 1495, the castles of Monsberg and Wartstein were destroyed. The castle was abandoned as a residence and fell into disrepair.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Oliver L. 74 · Wikimedia Commons · CC0
This description is a machine translation of an excerpt from the linked Wikipedia article. The source text was written by its authors, the translation is by Mobile History; like the original it is licensed under CC BY-SA 4.0.
Location: 48.2708, 9.5272