License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Canaletto (Giovanni Antonio Canal). A three-arched portico with an open lantern hanging at center, a triumphal arch and ruins of a classical temple in the background, from "Views" (Vedute altre prese da i luoghi altre ideate da Antonio Canal), 1735–46. The Metropolitan Museum of Art.