Fake Paris - Potemkin

During world war II, France created a fake city just like Paris on its North. Idea was to fool German plains to attack fake city leaving original one untouched. But war ended before the project was completed, so it was never put to test. 
London's Daily Telegraph explains that the fake city wasn't just a bunch of cardboard cutouts. Far from it. There were "electric lights, replica buildings, and even a copy of the Gare du Nord-the station from which high-speed trains now travel to and from London."