History Pin is a website devoted to collecting historical photography from around the world and placing the location of the photograph on the map. I know that Google World and Flickr have attempted to do the similar things with their geo-tagging features, but this places an emphasis on photography from its advent circa 1840 - 2001. While it is pretty difficult to navigate and is not entirely intuitive there have proven to be some awesome photos available.
I used to live in Chicago's Rogers Park neighborhood for several years, not entirely a neighborhood with a reputation for being lively or exciting - however I was able to find these gems taken in 1932:
Explore the site, it has some damn awesome stuff
