Cascade Loop
Boeing Assembly Plant, WA

The Boeing Assembly Plant is the world's largest building by volume at 472,000,000 cubic feet. The 747, 767, and 777, some of the biggest commercial airplanes, are built here. Visitors will see airplanes in various stages of flight test and manufacture. The weekday tours are an hour and a half and include a video about Boeing, a visit inside the factory building, and a drive along the flight line where completed 747, 767, and 777's are tested.