1) The document presents several historical photographs taken in the 1930s depicting workers during the construction of skyscrapers in New York City between 1920-1935. 2) The most famous photo is called "Lunch atop a Skyscraper" showing workers eating lunch on a girder at the 69th floor of what is now the GE Building in Rockefeller Center, taken on September 29, 1932. 3) Many of the photos were taken by photographer Charles C. Ebbets and published in the New York Herald Tribune to depict the working conditions and safety measures of the time.