To be privately owned
CastlePertlstein
Bertholdstein Castle

Bertholdstein was one of the largest hilltop castles built in the 12th century to secure the Raab Valley to the east. The builder was Berthold I von Emmerberg, a ministerialis of the Traungau counts. He erected a small clearing castle between 1170 and 1179.
Source: wehrbauten.at · Image: http://www.wehrbauten.at
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Location: 46.9314, 15.9564