The remains of the castle can be visited
Bellnhausen Castle

The Bellnhausen Castle Ruin, a former motte-and-bailey castle, is located in the Schwalm-Eder district of northern Hesse. Its remains, in a park, offer an insight into medieval defensive architecture.
History+
The origins of Bellnhausen Castle date back to the late 13th century, when the Lords of Bellnhausen built a small motte-and-bailey castle on an earth mound surrounded by a moat. In 1351, the castle was enfeoffed to the Counts of Ziegenhain and returned to the Lords of Bellnhausen as a castle fief. A renewed enfeoffment occurred in 1405. Around 1432, Engelbrecht von Bellnhausen sold his share of the castle to Count Johann II of Ziegenhain, which, after his death in 1450, fell to the Landgraviate of Hesse. The Lords of Bellnhausen are last documented in 1556. Their remaining shares in the castle and estate of Bellnhausen passed by inheritance to Reinhard Schenk, who also acquired the former Ziegenhain share in 1564.
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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: 50.9221, 9.0621