To be privately owned
Litzlberg Castle

On a small island in Lake Attersee is Litzlberg Castle, an example of historical architecture in Upper Austria. Originally conceived as a small castle, it today presents itself as a fully renovated estate.
History+
Litzlberg's origins date back to the early 14th century when it passed as a fief from Mondsee to Winter von Windern. In 1498, the castle changed hands when Preunhuber sold it to Martin von Polheim. The following centuries were marked by changes of ownership, including Weikart von Polheim in 1603 and Johann von Khunitz in 1655. An engraving from 1674 depicts Litzlberg as a complex with a square tower and a round tower, protected by a wooden bridge and palisades. In 1780, the already dilapidated masonry was dismantled to provide material for the reconstruction of the market town of Schörfling.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Schloss_Litzlberg.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: 47.9329, 13.5584