What is Going on Underneath this Old South Dakota Mine?What is Going on Underneath this Old South Dakota Mine?South Dakota is home to many things: Mount Rushmore, The Black Hills, and also a secret underground facility conducting some of the most mind-boggling experiments on earth.Andy GottAndy Gott
Where Is the Deepest Goldmine in the Country? Where Is the Deepest Goldmine in the Country? It's a little closer than you might think.Andy GottAndy Gott