This March 24, 2012 photo shows a view of the Ice Age Trail in Columbia County, Wis., as seen from Gibraltar Rock. A new book, "Thousand-Miler: Adventures Hiking the Ice Age Trail," by Melanie McManus, documents her experiences and the experiences of others who've hiked the 1,100-mile trail. The Ice Age Trail follows a landscape of woods, hills and wetlands sculpted by the retreat of glacial ice in Wisconsin eons ago. (Joanne Ellarson via AP)
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