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In Germany there's Bielefeld, a major city that, depending on your opinion, does or doesn't actually exist: http://en.wikipedia.org/wiki/Bielefeld_Conspiracy

Then of course there's also the Republic of Null Island http://www.nullisland.com

Hey, I'm part of the conspiracy: I've been to Bielefeld many times! :D

(There's a biannual pen&paper roleplaying convention there.)

How can you be sure it was really Bielefeld?

Technology has progressed to the point where these sort of pranks are harder to pull off. see: https://www.tineye.com/search/1f3e80b2699c7e8b8542883aefaab1... for null island and Google street view for Bielefeld.