The remains of the Castle can be visited
Château du Warthenberg

The Château du Warthenberg, a castle ruin, is on a rocky spur in the Northern Vosges near Ernolsheim-lès-Saverne. Its location on the Daubenschlagfelsen, a sandstone massif, once made it a control point in the region.
History+
The origins of Warthenberg Castle date back to the 12th century when it was built by Count Hugo VIII of Dagsburg to monitor the Neuweiler Abbey. A first documented mention dates to 1158. The Romanesque spur castle, which apparently remained unfinished, was abandoned in the 13th century in favor of Herrenstein Castle. Its masonry later served as a quarry.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Chateau_du_Warthenberg_1.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: 48.7937, 7.3758