What does Boeing do?
The Boeing Everett Factory is an airplane assembly building owned by Boeing. Located on the northeast 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 (98.3 acres). It is where wide-body Boeing 747s, 767s, 777s, and the new 787 Dreamliner are assembled.
Tours are given- see Future of Flight http://www.futureofflight.org/