To be privately owned
Obersiebenbrunn Castle

Obersiebenbrunn Castle, a Baroque castle with an extensive garden complex, is located in the municipality of Obersiebenbrunn in the district of Gänserndorf, Lower Austria, Austria. It is now a Coptic monastery.
History+
The origins of the castle date back to 1343, when a predecessor building was first documented. In the 17th century, the estate underwent a transformation in the early Baroque style under Georg Wilhelm Jörger. A change of ownership occurred in 1725 when Emperor Charles VI acquired the castle and gifted it to Prince Eugene of Savoy in the same year.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Obersiebenbrunn_Schlo%C3%9F_SW1.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: 48.2664, 16.7097