The remains of the Castle can be visited
Beetzendorf Castle

The Beetzendorf Castle Ruin, once a marsh castle, rises in the Altmarkkreis Salzwedel in Saxony-Anhalt. This former lowland castle developed around 1200 in marshy terrain and is connected to the history of the noble family von der Schulenburg.
History+
The origins of Beetzendorf Castle date back to around 1200, when it was built in a marshy area. A document from 1204 confirms that the complex was initially transferred as collateral from the von Kröcher family to the von der Schulenburg family. From 1340 onwards, the castle became the permanent property of the von der Schulenburgs after they had left their original ancestral seat near Stappenbeck. Beetzendorf developed in the following centuries into the family's main residence and, together with the properties in Apenburg, formed the core of their manorial lordship until the 19th century. Around 1600, the castle was expanded into a fortress-like complex with moats, which earned the von der Schulenburg family the status of "schlossgesessen" (castle-dwelling) nobility.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: User Axel Hindemith at de.wikipedia / Public domain via Wikimedia Commons
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: 52.7042, 11.0950