Boeing built the world’s largest building just to hide a plane.In the ’60s, the 747 was so massive they had to create a 98-acre factory — and planted fake trees to block spy planes.#fact #facts #generalknowledge #knowlage #learn #quiz #sciencefacts #weirdfacts #funfacts #tiktoklearn #mindblown #boeing #747 #aviation #planes #aircraft #aviationlovers #aviationgeek #everett #washington #historyfacts #engineering #factory #planefacts #knowledgebomb | Cockpit King