I received this from a family member who knows I am a bit of a history buff. During WWII the Lockheed Plant in Burbank California was a sprawling site employing thousands of people and building airplanes critical to winning the war. The site was easily recognizable from the air it was feared that Japanese airplanes would attempt to bomb it. Engineers devised a plan to hide the plant with camouflage netting and make the entire area appear as a residential neighborhood. The pictures to the right show the plant before and after the netting was put in place.
More photos of this monumental and amazing feat can be see here: http://www.anvari.org/cols/Hiding_Lockheed_Burbank_Aircraft_Plant.html