The reason this particular construction project was so well documented was that it was Rockefeller Center.
No one, not even the photographers, is wearing safety equipment.
The subjects and the photographer are unknown, but the photo is one of the most iconic of all time. With Central Park in the background, 11 men casually have lunch 800 feet above Manhattan. In this short piece by Time Magazine, archivist Christine Rouselle explores the story behind this historic image.