The remains of the Castle can be visited
Château de Langoiran

The Château de Langoiran, a castle ruin, is situated approximately 25 kilometers south of Bordeaux in the commune of Langoiran. It is known for its massive keep, which is among the largest and most defensible in Southern France, offering views over the Garonne valley.
History+
Although the castle and its lords were first documented in the 11th century, the oldest surviving parts date back to the 13th century. The complex was expanded until the end of the Renaissance. The fiefdom of Langoiran was a significant possession within the Duchy of Aquitaine and played a role in the conflicts between English and French monarchs.
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: 44.6991, -0.3817