Pittsburgh in space and time
I've seen this type of imagery before, but a NS reader out of the 14th ward pointed out a neat set of satellite maps put online by Time. No static link for particular regions, but you can zoom into any region of the world and look at a set of satellite images for each year since 1984. Below are what you get just for the two endpoints: 1984 and 2012.
update: I should have followed the provenance. I think Time is mostly using http://earthengine.google.org for the project and the images there.
It is clearer when you see their dyamic illustration flowing through the years, but note carefully the construction of 279 and ask yourself what that did to the population in a string of city of Pittsburgh neighborhoods. Also note all the completely greenfield construction that is now all that is Robinson Town Center and environs. If you look real close you can see the changes at a lot of the major brownfields over the years and also changes along the riverfronts.
Anyone else catch anything of note? I think I hypnotized myself watching it play over and over again.