Did you know Boeing's 747 factory in Everett was the largest building in the world by volume?

Boeing had no factory large enough to assemble the giant airliner, so it decided to build a new plant. The company studied sites in about 50 cities and eventually chose a plot some 30 miles (50 km) north of Seattle, next to a military base at Paine Field, near Everett, Washington. It bought the 780-acre (320 ha) site in June 1966. Grading it required moving more than four million cubic yards (three million cubic metres) of earth.

The plant was built in 1967 for the Boeing 747. Its main building is the largest ever built by volume and has been expanded several times to manufacture other Boeing wide-body commercial jets. According to Guinness World Records, its interior space is 472,370,319 cubic feet (13,376,037.9 m³). The building covers 98.3 acres (39.8 ha). The whole of Disneyland, or 75 American football fields, could fit inside it.

On 30 September 1968, the first 747 rolled out of the Everett assembly building before the world press and representatives of the 26 airlines that had ordered the aircraft.