We went to one or two on vacation when I was little, but I don't really remember them.
There was a town southwest of StLouis that used an oily water spray on their roads in the 70s to keep the dust down that they later learned had dioxin in it and the state just bought out all the residents in the early 80s. It was right on I-44 heading to Six Flags. It was odd because of it's fairly large size, the general modernness of the buildings/homes and how close it was to the interstate/civilization. I never actually went (though I think they opened it back up as a park in the last few years), but I drove passed it a hundred plus times.
Times Beach