Artist Lauren Orchowski created a very cool photographic series of Cold War era rocket-theme playground structures, named, naturally enough, Rocket Science. The photographs were taken with an 8 x 10 inch view camera between 2005 and 2008, all over the United States.
Kids: such structures come from a bygone era before playgrounds were scientifically designed and tested until they became impossible to hurt yourself on. In other words, they were dangerous, just like Cold War geopolitics. Duck and cover.