To be privately owned
Ochsenburg Castle

In the southernmost district of Ochsenburg in St. Pölten, Ochsenburg Castle is a structure situated on an approximately 30-meter-high rock outcrop on the right bank of the Traisen River. Originally a medieval fortress, it was transformed into a castle, now combining elements from various eras.
History+
The castle's origins date back to the Middle Ages, when it served as a fortress for the Lords of Ochsenburg. In the 16th century, it underwent a Renaissance-style renovation. Around 1698, the Baroque south wing was likely constructed under the direction of Jakob Prandtauer. In the 18th century, the St. Nicholas Chapel within the castle was redesigned, with Martin Johann Schmidt playing a role. From 1383 to 1530, the castle was owned by the Collegiate Church of St. Pölten, which reacquired it in 1699 under Provost Christoph Müller. Following the dissolution of the monastery during the Josephine Reforms in 1784, the castle became part of the Lower Austrian Religious Fund. From 1785, the newly established Diocese of St. Pölten used the property.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Schloss_Ochsenburg.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: 48.1309, 15.6340