The Grand Canyon of the Colorado

According to Wikipedia: "John Muir (April 21, 1838 - December 24, 1914) was a Scottish-born American naturalist, author, and early advocate of conservation of U.S. wilderness. His letters, essays, and books telling of his adventures in nature, and wildlife, especially in the Sierra Nevada Mountains of California, have been read by millions and are still popular today. His direct activism helped to save the Yosemite Valley, Sequoia National Park and other wilderness areas. The Sierra Club, w...