License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Anonymous, British, 19th century. Studies of the Pavilion at Fonthill, Wiltshire and Plans of the Ground and First Floors (recto); Studies for the Pavilion in Tudor-Gothic Style (verso), after 1824. The Metropolitan Museum of Art.