Prümerburg

Prümerburg - Credit: Wikimedia Commons

The Prümerburg is a ruined hill castle on a roughly 30-metre-high lias-sandstone rock on the upper edge of the valley of the Prüm in the municipality of Prümzurlay in the county of Bitburg-Prüm in the German state of Rhineland-Palatinate. Read more on Wikipedia

type: military installation
date from: 1100

Source: en.wikipedia.org