Château de Margon
The beautiful Château de Margon was originally constructed in the XIIIc but was remodelled in 1521 by Pierre de Plantavit. The arches of the butress wall are known as "Banastas". I guess that this is an Occitan word. The gardens and château can be visited, by appointment, in the Summer months. This photo is the result of stitching 2 photos together. I don't have a wide enough angle lens to take it in one!
(Canon EOS 450D, Sigma 17-70mm lens @ f/7.1, 1/500s. 2 photos stitched using Canon Photostitch)