The remains of the Castle can be visited
Château de Mehun-sur-Yèvre

The Château de Mehun-sur-Yèvre, a castle ruin, is located in the French commune of Mehun-sur-Yèvre in the Cher department.
History+
Originally, Mehun was a castle that passed to John of Luxembourg, King of Bohemia. Through the marriage of his daughter Jutta to the French King John II, the castle later became part of the appanage of Duke Jean de Valois, duc de Berry. Between 1367 and 1390, he had the structure extensively remodeled by his architect Guy de Dammartin. The formerly closed entrance side was opened, a projecting chapel was built above the main entrance, and the fortress was provided with high windows and viewing terraces on the towers.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Hervé Rebours
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: 47.1428, 2.2167