Falkenburg Castle is located in which country?

Falkenburg Castle is a castle ruin overlooking the village of Wilgartswiesen in the Palatinate Forest in Rhineland-Palatinate, Germany. Like almost all castles in this region it was built on sandstone. The castle was probably built in the 11th century as a successor to the nearby Wilgartaburg and to protect the adjacent villages. The elongated castle is in two parts: a 50-by-11-metre (164 by 36 ft) upper ward that was connected by a staircase to the lower ward with its gateway and drawbridge.

In the documents of Archbishop Erkinbald of Mainz, letters dating to 1019 describe a rock outcrop called the Falkenstein considered as the most northerly border belonging to the principality of Kaiserslautern. Werner I of Bolanden is thought to have begun construction of the castle on this rock in 1125; he was a vassal of Duke Frederick II of Swabia.