I stumbled on an article from The Register about a contest for finding images of black helicopters in Google Earth. Very tongue in cheek and all, but it enticed me to pull up Google Earth and do a little Google Earth Tourism myself. A few are one's I looked up from The Register's article, but I just went looking for interesting images. If you look at the names of the images (right-click, properties) you can find their geographic location in Google Earth yourself.