License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Carlo Antonio Buffagnotti. Vertical Oval Vignette of A Palace Interior with Two Figures Admiring Decoration; a Craggy Mountain Seen Through a Window in The Far Distance., late 17th century. The Metropolitan Museum of Art.