World War I was one of the most horrendous events and affected many. It also changed the way war was fought in general, urging many to go to extreme lengths to not only fight back but to hide in plain sight.
One instance revolved around France. When German bombings started to ravage France, they had to think hard to make sure that not only their cities were safe, but their people. So France did something spectacular, they built a fake Paris to fool the Germans into bombing away from their home.
Interestingly enough, the fake Paris was made out of just wood and fabric, which fooled the Germans enough to avoid the real Paris, saving many lives and homes in the process