To be privately owned
Restaurant
Taggenbrunn Castle

The castle ruin Taggenbrunn, a historical structure in the municipality of Sankt Georgen am Längsee in Carinthia, Austria, is situated at approximately 624 meters above sea level and houses a restaurant today.
History+
The origins of Taggenbrunn stretch back to a Celtic-Roman ring-wall settlement from the 6th century BC. In the early 12th century, specifically the first third, Tagenus von Pongau had a castle built on these ancient foundations on behalf of the Archbishopric of Salzburg. Taggenbrunn was first documented in 1142 and explicitly referred to as a castle in 1157. In 1258, the castle suffered destruction during a feud over the Archbishopric of Salzburg, but was rebuilt ten years later, in 1268. An episode was the imprisonment of Duke Ludwig of Carinthia by Salzburg Archbishop Konrad IV in 1292. From 1308, Taggenbrunn served as the seat of government for Carinthia, when Otto von Liechtenstein-Murau resided there as governor. In 1479, Archbishop Leonhard von Keutschach opened the fortress to the Hungarians, after which it was destroyed by imperial troops.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.at/ktn/kaernten.html
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 46.7716, 14.3902