This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Porte.Laon.Coucy.. La figure donne l'lvation extrieure de la porte de Laon Coucy les ponts tant supposs abattus et les herses leves Les hourds de bois de cet ouvrage taient videmment permanents et ports sur des consoles de pierre comme ceux du donjon du chteau ViolletleDuc Castle ViolletleDuc Portals ViolletleDuc Fortification