The remains of the Castle can be visited
Château de Belcastel

The Château de Belcastel is a medieval castle complex, situated above the north bank of the Aveyron River. Located in the eponymous commune of Belcastel, in the French department of Aveyron, this castle has a history of destruction and rebirth.
History+
The origins of the Château de Belcastel date back to the 9th century, when the oldest parts of the complex were built. The castle developed in the possession of the Belcastel family and later served as the ancestral seat of the Saunhac family. After the 17th century, the fortress increasingly fell into disrepair and eventually lay in ruins. In 1928, the Château de Belcastel was officially recognized as a historic monument. A turning point occurred in 1974, when the French architect Fernand Pouillon discovered the ruin.
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: 44.3889, 2.3360