The New York City Department of Records just digitized over 870,000 never-before-seen photos and put them online. There are many black & white pics from the 1930s showing the cityscape and even some crime scene photos. The vast majority of the pics are color from the 1980s when the city photographed every single building. The gallery is through here but it's currently down from everyone wanting to see. The DailyMail.co.uk has some posted in an article.