A gigantic factory spanning more than 472 million cubic feet holds the record as the world's largest building — and even has its own microclimate. The vast Boeing facility in Everett, Washington, overshadows its nearest rival, the Tesla Gigafactory, by 33%. It has also produced more than 5,000 wide-bodied aircraft since first opening in 1967. The staggering site covers 98 acres of land. To put that into context, the original Disneyland resort in Anaheim, California, occupies approximately 85