To be privately owned
Aigenegg Castle

In Thalheim bei Wels in Upper Austria stands Aigenegg Castle, a two-winged estate with a corner tower. Originally a manor house and later a brewery, it acquired its castle-like appearance in the early 20th century.
History+
The origins of the estate date back to 1354, when a manor house belonging to Kremsmünster Abbey was sold to Hartneid Krämer from Wels. In 1610, Wolf Weinbergmayr, known as a peasant leader during the Peasants' War, founded a brewery on this site and received brewing rights in 1629. The brewery changed hands several times, including the Obauer family, who produced around 4000 buckets of beer annually until 1831. After further changes of ownership, the brewery in Thalheim ceased operations when it was acquired by the Wels Brewery Cooperative in 1908. Between 1910 and 1913, the building received its current appearance as a castle, shaped by Anton Gartner von Romansbrück, who had a new roof truss and the tower erected. In the following decades, the castle changed hands multiple times, including Josefine Gilnow, Moritz Maas, and Josef Eska, a glove manufacturer who established a production facility here.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Schloss_Aigenegg,_Thalheim.jpg
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: 48.1514, 14.0324