The Fortress can be visited
FortressFriesach
Rotturm Fortress

After the warlike conflicts in the second half of the 13th century and the further development of defense technology, the city fortifications on the west side were expanded towards the end of the 13th century.
Source: wehrbauten.at · Image: http://www.wehrbauten.at/ktn/kaernten.html
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Location: 46.9496, 14.4031