License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Jacques Androuet Du Cerceau. Floorplan, Façade and Cross Section of one of the Chapels at Château d'Anet, from "Les plus excellents bastiments de France", 1607. The Metropolitan Museum of Art.