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

The Freudenburg ruin is on a western spur of the Eiderberg in the village of Freudenburg, within the Trier-Saarburg district of Rhineland-Palatinate. This hilltop castle, once part of a defense system, offers a glimpse into medieval military architecture even in its ruined state.
History+
Freudenburg was constructed between 1330 and 1337 under King John of Bohemia, who was also Count of Luxembourg. Its purpose was to secure the Eiderberg as a strategically important point between Trier and Luxembourg. The castle later passed into the possession of his uncle, the Archbishop and Elector of Trier, Balduin of Luxembourg. The structure began to decay in the 15th century. In 1589, it came under the ownership of the Imperial Abbey of St. Maximin in Trier and was restored under Abbot Reiner Biewer. Its destruction occurred in 1646 during a conflict between the abbey and the Electorate of Trier, when Elector Philipp Christoph von Sötern occupied the castle. Following secularization, the ruin initially belonged to the United Hospices before being sold to the municipality of Freudenburg in 1861. Stabilization work took place in 1908 and again in 1980.
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: 49.5397, 6.5300