The remains of the Castle can be visited
Museum
CastleFriesach
Petersberg Castle

Archbishop Gebhard of Salzburg had Petersberg fortified in 1076, above Friesach. Presumably, these were primarily simple wooden structures that reinforced an already existing old defensive system.
Source: wehrbauten.at · Image: http://www.wehrbauten.at/ktn/kaernten.html
Text and/or image for this object come from the linked site and are used with the permission of its operators; the linked page remains the copyright of its authors. The legacy catalogue kept text source and image source in a single field, so which part came from there can no longer be told apart entry by entry.
Location: 46.9519, 14.4017