To be privately owned
Heuberg Castle

In Bruck an der Großglocknerstraße, in the Austrian state of Salzburg, Heuberg Castle is situated on the sunny side of the Salzach Valley. It is distinguished by its history as a former administrative seat and its architecture.
History+
The origins of Heuberg Castle date back to before 1100, when it was built by the Counts of Sulzbach under the name Hof zu Niederheim. Through a donation from Irmgard von Sulzbach, it came into the possession of the Prince-Bishopric of Berchtesgaden and subsequently served as the administrative seat of the Niederheim Provostry. This provostry managed lands, which led to conflicts with the Archbishopric of Salzburg. Pope Paschal II placed the Berchtesgaden monastery and its possessions, including Niederheim, under his protection in 1105. The name “Heyberch” first appeared in 1296, and by 1454, there was mention of “Gericht und Herlikait am Heuperg” (court and lordship on Heuperg). In 1669, a fire destroyed the castle, but it was rebuilt in a simplified form by 1673. After the secularization in 1803, the property passed to the Bavarian state and was later sold to Karl Freiherr von Moll. Following another fire in 1900, renovations were undertaken. The castle remained in the possession of the Scherer family for generations before being sold to the Porsche family in 1970.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de/thread.php?threadid=1284
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: 47.2915, 12.8763