Hanford housed the first plutonium reactor in the world, that created the plutonium for the first atomic bomb at Trinity and the "Fat Man" bomb that was dropped

Hanford housed the first plutonium reactor in the world, that created the plutonium for the first atomic bomb at Trinity and the "Fat Man" bomb that was dropped on Nagasaki. It expanded to 9 nuclear reactors and 5 plutonium processing facilities during the Cold War and produced most of the plutonium for the 60,000 weapons in the US nuclear arsenal. Because of poor safety procedures and waste disposal practices the site is a $500B dollar cleanup disaster (and costs might continue to increase well beyond that).