San Marco, Venice, Italy
This is a faithful photographic reproduction of a two-dimensional, public domain work of art. The official position taken by the Wikimedia Foundation is that "faithful reproductions of two-dimensional public domain works of art are public domain". This photographic reproduction is therefore also considered to be in the public domain in the United States.
B. Byzantine Venice
Michele Giambono, “The Visitation,” Venetian Art, accessed January 28, 2020, http://library.bc.edu/venetianart/items/show/514.