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Details and gives directions to more than 20 accessible caves, including some in northeastern Iowa; descriptions of lead and zinc mines in Wisconsin and northern Illinois, and copper and iron mines in Michigan's Upper Peninsula; includes a guide to railroad tunnels and other underground spaces that were created for specific purposes, including beer and wine storage, human escape routes, and lead shot production.
Explore more than 50 of Minnesota and South Dakota's fascinating caves, mines, sinks, and other underground oddities! This comprehensive guide covers Minnesota iron mines in the north and caves in the south. Also featured are gold mines and caves in the Black Hills of South Dakota, an area that boasts of some of the longer and more magnificent sites in the world. Spelunkers and explorers alike will enjoy this wonderful edition. Book jacket.