The remains of the Castle can be visited
CastleMaria Wörth-Reifnitz
Reifnitz Castle

The first attempt to build a fortified complex on the castle rock near St. Margarethen-Reifnitz probably dates back to the 8th or 9th century. In the following centuries, this developed into one of the most powerful castles around Lake Wörthersee, dominating the entire southern shore and the Keutschach lake valley.
Source: wehrbauten.at · Image: http://www.wehrbauten.at/ktn/kaernten.html
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Location: 46.6001, 14.1633