License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Stefano della Bella. Three Turks and an Italian gentleman standing to right, men work on small boats in center, a fortress to left in the background, from "Set of eight nautical landscapes" (Suite de huit Marines), 1639. The Metropolitan Museum of Art.