The remains of the Castle can be visited
CastleSt. Stefan ob Leoben-Kaisersberg
Kaisersberg Castle (Old Castle)

Kaisersberg Castle probably originated in the 12th century, but the first, likely mostly wooden, structure may date back to the 11th century.
Kaisersberg was then a princely fief, granted to the Counts of Pfannberg. They or one of their vassals are presumed to be the builders of the castle.
Source: wehrbauten.at · Image: http://www.wehrbauten.at
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Location: 47.3357, 14.9798