By Attila Nagy

This is the historical X-10 Graphite Reactor at Oak Ridge National Laboratory in Oak Ridge, Tennessee. Weirdly enough, it now has a National Park Service sign—but why?

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Source:: http://feeds.gawker.com/~r/gizmodo/full/~3/eyxCvVO7aC4/why-does-this-nuclear-reactor-have-a-national-park-sign-1742739849