Tours de Merle

The Tours de Merle ('Towers of Merle') are the ruins of a castle in the commune of Saint-Geniez-ô-Merle, in the Corrèze département of France. A feudal fortress from the twelfth and fifteenth centuries, classified as a historic monument since July 30, 1927.

I could not find a good description in English, but for those who read French this is quite interesting :

https://fr.wikipedia.org/wiki/Tours_de_Merle