The remains of the castle can be visited
Château du Hagelschloss

The Château du Hagelschloss, also known as Waldsberg, is a castle ruin constructed in the 13th century in the commune of Ottrott in the French Bas-Rhin department.
History+
The origins of the Château du Hagelschloss date back to the 13th century when it was built. It likely received its name due to its position above the Hagelthal valley. In the 19th century, it was known as Waldberg and is mentioned as such in historical records. Although the ruin is now considered dilapidated, it does not have official protection as a historic monument.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Hagelschloss_ou_Waldsberg.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: 48.4493, 7.3892