To be privately owned
CastleEmmersdorf an der Donau-St. Georgen
Luberegg Castle

Schloss Luberegg – A Historical Gem+
Schloss Luberegg was built between 1774-87 by Friedrich Joseph Edler von Fürnberg. In 1795, ownership transferred to Emperor Franz II, who used it as a summer residence from 1803-11.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: https://commons.wikimedia.org/wiki/File:Luberegg_Schlossanlage_01.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: 48.2326, 15.3139