S.P. Dinsmore's Crypt at the Garden of Eden in Lucas, KS
The flag is in the lower center of the image, and made of concrete. The bird is a wild turkey, which Dinsmore, like Benjamin Franklin, thought was a better candidate than the bald eagle for the USA national bird.
EDIT: On the right side is the working man being crucified by the Lawyer, the Priest, the Banker, and the Politician.