Google has a new image search where you can throw a picture's URL into the GIS, and it actually searches for similar images. I think that's cheating. But if you are smart enough to know how to search for images while using descriptive words, then I think that's fair. My picture a few posts back could be searched for with "jungle island city" or something like that.
Otherwise is really is impossible. Either you know it, or you don't.
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