The most comprehensive collection of Ansel Adams's photographs of America's national parks and wilderness areas, with more than 200 photographs — many rarely seen and some never before published. For many people, Yosemite, Yellowstone, Glacier National Park, and other iconic American wildlands exist in the mind's eye as Ansel Adams photographs. The legendary photographer explored more than forty national parks in his lifetime, producing some of the most indelible images of the natural world ever made. One of the twentieth century's most ardent champions of the park and wilderness systems, Adams also helped preserve additional natural areas and protect existing ones through his photographs, essays, and letter-writing campaigns.