Eltz Castle in Rhineland-Palatinate by EuroTourData
Eltz Castle is the restored hill castle, built around 1130 (not confirmed) in order to control the trade route of the Elzbach River.

Image copyright info
© Creative Commons: Reichsburg, Cochem, Germany, author Derzno. License: CC BY-SA 4.0. Cropped from original.
Eltz Castle history
During the Eltz Feud, the Lords of Eltz, along with other free imperial knights, opposed the territorial policies of Archbishop and Elector of Trier. The besieged castle was able to hold out for two years, but then they were forced to surrender. Between 1604 and 1661 the castle was enlarged and modernized.
The castle has been owned by the Eltz family for over 800 years. Parts of the castle are accessible to tourists during the summer months. Tours run daily from April 1st to November 1st. The collection, collected from family property from different centuries, is the castle museum that includes a collection of weapons.
Source
The article Burg Eltz of German Wikipedia.