To be privately owned
Bunderhee Castle

In Bunderhee, a district of the municipality of Bunde in the Leer district, Lower Saxony, Germany, stands Burg Bunderhee, a stone house from the 14th century. It is one of the oldest preserved castles in East Frisia. As a former chieftain's residence in the Rheiderland, near Bunde, it has a largely unaltered basic structure and a later added baroque extension.
History+
According to oral tradition, the origins of Burg Bunderhee date back to the 9th or 10th century, although the current tower castle was built in the 14th century according to current research. Originally, the three-story complex served primarily as a protective and storage building, not as a residence. Special privileges of the local chieftains must have enabled its construction, as Frisian law prohibited tall stone houses. In the 16th century, the stone house was converted into a residential building, with windows enlarged and fireplaces installed. In 1712, Johannes van Heteren began building a baroque residential extension on the west side, which was completed in 1735.
Image: https://de.wikipedia.org/wiki/Datei:Bunderhee_Steinhaus_S%C3%BCdseite.jpg
Location: 53.1989, 7.2832