This is the Eltz castle in Germany, not far from Koblenz where the Rhein
and Mosel rivers meet. Great place for wine tasting too :)

Owned by the same family over the last 8 centuries, it is a private castle.
Some consider it one of the most charming medieval castles in Germany and
I can certainly testify it is worth a trip.

Photo is geotagged for loction, more practical details here:

http://www.burg-eltz.de/e_index.html