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During World War I, the French built a “fake Paris”.
Complete with a replica Champs-Elysées and Gard Du Nord, this “fake Paris” was built by the French towards the end of WWI. It was built as a means of throwing off German bomber and fighter pilots flying over French skies.
It also even had a fake railway that lit up at certain points to provide the illusion from above of a train moving along the tracks!