The U.S. National Archives and Records Administration has a great digital collection titled American Cities which "depicts the city, its development, and its people and their way of life from the early 19th century to recent times."
This photograph from the American Cities series (archive #518290) features a fantastic shot of a workman piecing together steel beams while balancing on the edge of the under-construction Empire State Building. The Chrysler Building dominates the background.
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