Remember, the story from a few weeks ago about someone spotting a stealth bomber in a Google satellite image? Well, if you're interested in other interesting things and locations seen from the sky, read on.
Long before Google was providing access to satellite and aerial images the Cryptome archive has been building a collection of satellite and aerial images that look at "interesting" locations using open-source imagery provided by various organizations including the United States Geological Survey (USGS). Direct access to the USGS database of aerial imagery is available here.
It's uncertain if the makers of UFOs visiting earth will be upset at this spotting from Google Maps, however.