The remains of the Castle can be visited
Breitenstein Castle

In the Bavarian district of Amberg-Sulzbach is the Breitenstein Castle Ruin. Its Romanesque double chapel is considered the only structure of its kind in the Upper Palatinate.
History+
Built in the 12th century by the Lords of Breitenstein, the castle was first documented in 1279 with Heinrich von Breitenstein. In 1356, the Breitenstein family placed themselves under the protection of Emperor Charles IV, making the castle an imperial fief and mortgaged to Duke Stephan of Bavaria in the 14th century. After the Breitenstein lineage died out in 1666, the dominion fell to the Duchy of Sulzbach, and the complex began to decay. In 1713, Eleonore, wife of Palatine Count and Duke of Sulzbach Theodor Eustach, had the castle chapel renovated, which blocked the original access to the main castle through the chapel's lower floor. In the 18th century, the castle was used as a quarry. Between 1973 and 1974, the damaged chapel underwent renovation.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:DoppelkapelleBreitenstein1.jpg
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 49.5997, 11.6479