The remains of the Castle can be visited
Château de Pouancé

In the French region of Pays de la Loire, specifically in Pouancé in the Maine-et-Loire department, lies the castle ruin Château de Pouancé. As one of the largest fortifications of historical Anjou, situated directly on the border with Brittany, it played a strategic role for centuries.
History+
The origins of fortifications at this site date back to the 11th century. The castle in its current form was constructed between the 12th and 15th centuries. During the Hundred Years' War, the Château de Pouancé faced multiple sieges and evolved into a fortress at the end of the 15th century during the "Mad War". The decline of the complex began in the 16th century, and from the 18th century onwards, it was completely abandoned. In the 1960s, the ruin was saved from demolition thanks to the commitment of a local resident.
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: 47.7419, -1.1783