To be privately owned
Neu-Asseburg Castle

Neu-Asseburg Castle is a small hunting lodge built in 1596 by the Counts of Asseburg, a noble family originating from near Braunschweig. The hope for mineral resources such as gold and copper prompted the Count to buy a large plot of land in the Mansfeld region. The castle was built, and afterwards it was discovered that the investment was made too far north of the regional copper veins. The property was sold again.
After a series of constantly changing owners, the property fell into the possession of the Prussian king, who bequeathed the castle to his illegitimate children. This Mr. Prillewitz, the king's illegitimate son, also had no luck with the property; his children died at a young age. Even today, three large graves with large inscribed gravestones can be seen on the castle hill.
After the assassination attempt on Hitler, one of the conspirators, the Lord Mayor of Leipzig Carl Friedrich Goerdeler, hid here with the then owner of Neu-Asseburg, Carl Wentzel.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Roland Neubert, Halle (Saale)
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: 51.5713, 11.4160