The remains of the Castle can be visited
CastleBirkenfeld
Birkenfeld Castle

The name Birkenfeld points to a Frankish settlement at a location notable for its birch trees. Birkenfeld was first mentioned in 981 in a church document which indicates that the place Birkenfeld already existed around 700.
Source: burg-birkenfeld.org · Image: http://de.wikipedia.org/wiki/Datei:Birkenfeld-nahe-torhaus.jpg
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Location: 49.6397, 7.1656