The Tour de Nesle.
From Dictionnaire raisonné de l’architecture française du XIe au XVIe siècle (Reasoned dictionary of French architecture, from the XIth to the XVIth century) , vol. 9 by E. Viollet-Le-Duc. Paris, 1875.
(Source: archive.org )
url: http://netlex.tumblr.com/post/70473152583 by Netlex