Phoney Paris constructed to fool German bombers

[Phidippides]

I was wondering if bombers would have been fooled by a fake city when bombing from low altitudes, but it seems that it was only initially that Zepplins bombed near the ground (3000 ft).  Eventually they got to the height of 20,000 ft.  It makes sense, then, that the fake city would be built toward the end of the war.

During World War I, the French created a dummy version of Paris to the city's immediate north. The plan was to fool German planes into thinking the Potemkin city was the real thing, thus leaving the  City of Lights untouched by bombs.

During World War I, France built a fake Paris to fool Germany

[Aetheling]

That's very surprising, nowhere have I heard about such a dummy city all along the 93 years following 1918 ...   That's misinformation as it was just a project and never realized ! (another kind of Ligne Maginot-style delirium)