The remains of the Castle can be visited
CastleGallmannsegg
Hauenstein Castle

Regarding the lords of Hauenstein, the castle site was originally probably owned by the Eppensteiners, before it passed from them to the Styrian provincial princes. In 1222, a Wulfing von Hanau is mentioned as the owner.
Source: wehrbauten.at · Image: http://www.wehrbauten.at
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Location: 47.1907, 15.0754