The remains of the castle can be visited
Wilgartaburg Castle
Near Wilgartswiesen in the Südwestpfalz district, Rhineland-Palatinate, Germany, are the Wilgartaburg castle remains, also known as Wiligartaburg, Wilgartsburg, or Wiligartisburg. The former rock castle is situated on a spur of the Göckelberg and is considered one of the oldest structures of its kind in the Palatinate.
History+
The Wilgartaburg is regarded as one of the earliest castle complexes in the Palatinate, with origins likely dating back to the 8th or 9th century.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:Wilgartaburg.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: 49.2249, 7.9003