To be privately owned
Frauenstein Castle

Frauenstein Castle is a historic building in Mining-Frauenstein, Upper Austria. Originally a medieval fortress, it has been transformed and expanded multiple times, always maintaining its presence on the Inn River.
History+
The origins of Frauenstein date back a long time, as evidenced by Celtic grave finds from 1905 and a Roman watchtower that secured the landing site on the navigable Inn. In the 10th century, during the Hungarian invasions, Gregor von Pogen had a castle built here. Later, ownership passed to the Counts of Ering. Between 1296 and 1377, the castle was pledged to the Counts of Hals. In 1400, Knight Wilhelm von Fraunhofen acquired the complex, rebuilt it, and renamed it Frauenstein. Duke Heinrich the Rich of Lower Bavaria-Landshut bought the castle in 1435 and united it with the Ering dominion. After being plundered during the War of the Succession of Lower Bavaria, the Duke sold Frauenstein in 1508 to the Paumgartner family, who owned it until 1885 and had parts of the castle rebuilt between 1508 and 1519. In 1807, a part of the castle was demolished and a manor house was erected. Since 1883, the castle has been owned by the Venningen family. Between 1939 and 1942, the construction of the Ering-Frauenstein power plant led to the damming of the Inn, changing the castle's original location on a rock above the river. From 1999, the association “Lebenswertes Frauenstein” leased the castle and began revitalization and renovation work.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.at
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: 48.2880, 13.1618