Schlüsselstein Castle

Schlüsselstein Castle - Credit: Wikimedia Commons

Schlüsselstein Castle was a castle and the seat of a noble family, probably dating to the High Middle Ages, the remains of which lie above the town of Ebermannstadt in the Upper Franconian county of Forchheim in the south German state of Bavaria. The site is known locally as Burgstall Schlüsselstein. Read more on Wikipedia

type: military installation
date from: probably during the second half of the 12th century

Source: en.wikipedia.org