Two builders during the construction of the Empire State Building, c 1933. [Getty Images]

Two builders resting during the construction of the Empire State Building, New York, circa 1933. Photograph by Lewis Wickes Hine (1874-1940). Hine was the official photographer of the Empire State Building, and his many images celebrate the enormity of the enterprise. (Photo by SSPL/Getty Images)

SSPL Science & Society Picture Library