The town my father in law is from has the Soudan Mine, which is also used for particle research. Kind of a neat tour if you ever get up that way. https://en.wi

The town my father in law is from has the Soudan Mine, which is also used for particle research. Kind of a neat tour if you ever get up that way. https://en.wikipedia.org/wiki/Soudan_Underground_Mine_State_Park https://en.wikipedia.org/wiki/Soudan_Underground_Mine_State_...