To be privately owned
Kogl Castle

In Laussa, Upper Austria, stands Kogl Castle. Originally a farmhouse, this estate was transformed into a castle.
History+
The transformation of the original farmhouse into a castle is attributed to Baron Colonel von Voglsang. The estate changed hands multiple times. Among the known owners were Josef Magerle, Karl Hesse, Karl Fiedler, and Josef Altmann. In 1891, Max Strobl von Ravelsberg acquired the castle. In 1930, it passed into the possession of Dr. Tomke, who in turn sold it to Mr. Untersinger in 1960. For a period, the renovated castle served as a guesthouse, but today it is uninhabited.
Location+
Kogl Castle is located in the municipality of Laussa in the Steyr-Land district of Upper Austria, Austria, at an elevation of approximately 455 meters above sea level.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Schloss_Kogl.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: 47.9484, 14.4656