To be privately owned
Kolk Castle

This knight's seat, dating from the first half of the 14th century, to which Theodor Fontane also dedicated a literary monument in his "Wanderungen durch die Mark Brandenburg", goes back to a collateral line of the noble family von Holthuysen, whose descendants called themselves "von Colck" according to their new residence.
Source: uedem.de · Image: http://www.wehrbauten.de/thread.php?threadid=566&hilight=Borghees
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Location: 51.6635, 6.3003