An old atom smasher...the Atomic Physics Observatory in Washington DC

"There's a derelict atom smasher nestled in the middle of suburban Washington DC. The old Atomic Physics Observatory sits in the middle of the Carnegie Institution's Department of Terrestrial Magnetism, a scientific research campus in the city's Chevy Chase neighborhood. The APO was named and likewise designed to look like an astronomical observatory, in hopes that the nearby residents wouldn't put up too much of a fuss when the Department of Terrestrial Magnetism built a particle accelerator in the well-off suburb."

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