To be privately owned
CastleHorstmar
Alst Castle (Horstmar)

On a flat hill above a narrow stream, hidden among old trees, lies the small but remarkable moated castle. It is first mentioned in a document from 1217. As it belonged to the convent in Vreden near Ahaus, the owners changed very often.
Source: wehrbauten.de
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Location: 52.0932, 7.3361