The remains of the castle can be visited
Caldern Castle

Caldern Castle is the ruin of a medieval spur castle at 315 m above sea level near the district of Caldern in the municipality of Lahntal in the Marburg-Biedenkopf district in Hesse. Neither the construction period nor the owners of the castle are known. The castle was probably built in the 11th century over a predecessor building.
On December 2, 1944, a German fighter plane crashed into the mountain after being shot down by an American fighter plane. The 19-year-old pilot died in the crash. A memorial stone has been at the crash site since 2007.
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Of the small castle complex, only remnants of the residential tower, the curtain wall, and a neck ditch remain. The keep had a base area of 7.5 by 10 meters and a wall thickness of approximately 1.4 meters. The entire castle had a base area of about 28 by 23 meters.
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Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Burg_Caldern#mediaviewer/Datei:Burg_zu_Caldern.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: 50.8391, 8.6549