To be privately owned
CastleGrimmenstein
Grimmenstein Castle

The name Grimmenstein actually stands for three medieval castles. However, only remnants of the square keep of Hochgrimmenstein, located at the summit of the Kulmriegel, have survived.
Source: wehrbauten.at · Image: http://www.wehrbauten.at/noe/niederoesterreich.html
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Location: 47.6320, 16.1204