The remains of the Castle can be visited
Wildenburg Castle

On the Wildenburger Kopf near Kempfeld in Rhineland-Pfalz, the Wildenburg castle ruin, a former hilltop castle in the Hunsrück, stands. Its history spans from Celtic origins to a later Roman fortification, before it was built as the Wildenburg in the Middle Ages and today serves as an accessible ruin with an observation tower.
History+
The origins of the Wildenburg reach far back, as a double rampart indicates a Celtic refuge castle from the La Tène period. Around 350 AD, a short-lived late Roman fortification was established at the same location. The medieval Wildenburg was built by the Wildgrafen on a rock at the western tip of the ring wall and was first documented in 1330. In 1651, the castle was plundered and destroyed by Lotharingian troops. After a partial reconstruction in 1660, the lower castle served as the administrative seat for the Wildenburg office until the dissolution of the county in 1792.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Wildenburg.jpg?uselang=de
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: 49.7760, 7.2560