The remains of the Castle can be visited
Rotenburg Castle (Ruin)

The Rotenburg Ruin, also known as Rotenburg on the Alter Turm, is a hilltop castle ruin in Northern Hesse and presumably the namesake of the nearby town of Rotenburg an der Fulda.
History+
The first documented mention of the castle dates back to 1170. During this period, the first castellans, the “von Rodenberc” family, were also named. It is believed that the Ludowingians, Landgraves of Thuringia, had the castle built after 1122, following their acquisition of the Vogtei over Hersfeld Abbey. However, it is also conceivable that the Gisonians had already established initial fortifications at this site. After the death of the last Ludowingian in 1247 and the subsequent War of the Thuringian Succession, the Hessian possessions, including the Rodenberg Vogtei castle, fell to Henry I, the first Landgrave of Hesse. The castle subsequently served as a Hessian fief for various noble families.
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: 51.0108, 9.7364