File:Plan.chateau.La.Roche.Guyon.png

...La fig. 21 donne, en A, l'emplacement du château de La Roche-Guyon. Par un pont volant B communiquant avec les étages supérieurs du château, on arrivait à la plate-forme C taillée dans la colline coupée à pic; cette plate-forme donnait entrée dans un premier souterrain ascendant, qui aboutissait à une seconde plate-forme D à ciel ouvert...

This image comes from Dictionary of French Architecture from 11th to 16th Century (1856) by Eugène Viollet-le-Duc (1814-1879).

	This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse