To be privately owned
The Castle grounds can be visited
Milkel Castle

In the municipality of Radibor, on the northern edge of the village of Milkel, is Milkel Castle, a Baroque castle in Upper Lusatia. The complex is now once again surrounded by water and rests on oak piles.
History+
The origins of Milkel date back a long way; a wooden defensive and residential tower may have stood here as early as the 9th century. Finds of oak piles from 1302 prove the existence of early stone buildings and are considered the first evidence of ancient German moated castles built on oak piles in Upper Lusatia. Around 1300, Friedrich von Metzradt established the manorial seat of Milkel, whose family resided here until 1595. The castle changed hands several times and was continuously expanded. The von Ponickau family shaped its current appearance by having the north tower built in 1719/20. From 1769 to 1908, Milkel was owned by the von Einsiedel family.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: https://commons.wikimedia.org/wiki/File:Barockschloss_Milkel_Front_01.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: 51.2998, 14.4608