The remains of the castle can be visited
CastleSt. Leonhard am Hornerwald
Rundersburg Castle
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The Rundersburg is widely believed to be the oldest ruin in the Kamp Valley. Together with the neighboring castles of Thurnberg and Idolsberg, the Rundersburg had to secure the part of the Polansteig leading from Horn to Zwettl, which was one of the oldest trade routes in the Waldviertel.
Source: wehrbauten.at
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Location: 48.6127, 15.5088