The remains of the Castle can be visited
CastleThomasberg
Thomasberg Castle

In a document from Otakar IV, Otto de domesperg is mentioned in 1192. He was a ministerialis of the Styrian Ottokars. His fortified building was probably not located at the site of the present castle. The current complex dates from the mid-13th century. The families Torsäuler or von Ziegersberg are presumed to be the builders.
Source: wehrbauten.at · Image: http://www.wehrbauten.at/noe/niederoesterreich.html
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Location: 47.5678, 16.1452