In the late 1800s, John Muir made several trips to the pristine, relatively unexplored territory of Alaska, irresistibly drawn to its awe-inspiring glaciers and its wild menagerie of bears, bald eagles, wolves, and whales. Half-poet and half-geologist, he recorded his experiences and reflections in Travels in Alaska , a work he was in the process of completing at the time of his death in 1914. As Edward Hoagland writes in his Introduction, "A century...