License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Andrea Palladio. Design for a Corinthian Hall, in The Architecture of A. Palladio in Four Books containing a Short Treatise on the Five Orders (L'Architecture de A. Palladio en quatre livres... / Il quattro libri dell'architettura) (Volume 1, book 2, plate 28), 1715 [1716–20]. The Metropolitan Museum of Art.