Boeing Factory

A building that can accumulate clouds and rain is mad respect. The Boeing factory near Seattle is so massive, it once began generating its own weather systems. A state-of-the-art air circulation system had to be installed inside the monolithic manufacturing plant because clouds - the product of accumulated warm air and moisture - were forming inside. About 25,000 people work at the site, which boasts its own security force and fire department, a fully equipped medical clinic, a childcare centre, a water treatment plant, its own electrical sub-stations, and 19 cafeterias which serve around 17,000 meals per day. They say 2142 average-sized American homes could fit inside the factory. Just the hangar doors are each roughly the size of an American football field.