= Argonne National Laboratory
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This is where they moved the <Chicago Pile-1> after they decided it might be a bad idea to run <Chicago Pile-1>[highly experimental nuclear reactions] right in the middle of one of the most populous cities of the <United States>.
After it was reassembled, the <Chicago Pile-1> was renamed as Chicago Pile 2 (CP2).
So more precisely, it is a continuation of the <Metallurgical Laboratory>.
It's still not that far though, only about 20 kilometers, and today is also a populated area.
<Ciro Santilli> maintains that they chose the site because the name is so cool. Wikipedia says it is derived from the https://en.wikipedia.org/wiki/Forest_of_Argonne[Forest of Argonne], maybe it even shared etymology with the element <argon>.