Nideggen Castle in North Rhine-Westphalia by EuroTourData
Nideggen Castle is the restored hill castle, built around 1177 for the Duchy of Jülich as the counter-castle in order to protect the fiefs from the aggression of the Archbishop of Cologne.

Image info
View from the courtyard to the donjon and walls of the hall of Nideggen Castle in North Rhine-Westphalia.
© Creative Commons: Nideggen - Burg 14 ies, author Frank Vincentz. License: CC BY-SA 3.0. Cropped from original.
Nideggen Castle history
The castle was greatly enlarged from 1340 by William V, later Duke William I. During the Guelders Wars, Nideggen Castle was destroyed by imperial artillery in 1542. In 1689, the castle was captured and burned by French troops during the Nine Years' War. After the earthquakes of 1755 and 1878, the castle fell into ruins.
In 1888 the inhabitants of Niedeggen bought the ruins of the castle and in 1905 donated them to the Düren district. The castle contains the Nideggen Castle Museum.
Source
The article Burg Nideggen of German Wikipedia.