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The Boeing Everett Factory, in Everett, Washington, is an airplane assembly building owned by Boeing. Located on the north-east corner of Paine Field, it is the largest building in the world by volume at 13,385,378 m3 (472,370,319 cu ft) and covers 399,480 m2 (98.7 acres; 39.948 hectares; 0.399 square kilometres). This is the factory where the wide-body Boeing 747, 767, 777, and 787 are assembled.

https://en.wikipedia.org/wiki/Boeing_Everett_Factory