The remains of the Castle can be visited
Hasungen Abbey (Ruin) (Castlehasungen)

The Hasungen Abbey Ruin, also known as Burghasungen Monastery, was once a Benedictine abbey on the Burghasunger Mountain. Located in North Hesse, it was one of the wealthiest monasteries in the region during the Middle Ages and a widely known pilgrimage site.
History+
The origins of the monastery date back to the early 11th century, when the itinerant preacher Heimerad worked on the Hasunger Mountain, and after his death in 1019, a chapel was erected over his grave. In 1074, Archbishop Siegfried I of Mainz founded a canonry, which was converted into a Benedictine monastery of the Hirsau Observance in 1080/81. Despite initial political tensions under the first abbot Lampert of Hersfeld, the monastery flourished and acquired extensive property.
Source: Wikipedia · Licence: CC BY-SA 4.0
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: 51.3228, 9.2749