The classic, best-loved book by the founding father of modern conservation In the summer of 1869, John Muir set out from California's Central Valley with a flock of sheep and trekked into the foothills of the Sierra Nevadas. His journals describe the summer he spent in what would become Yosemite National Park. Celebrating the Sierra's lizards and mountain lions, tall trees and waterfalls, fierce thunderstorms and bears, Muir introduces a spiritual dimension to our awareness of nature. John Muir is internationally acknowledged as one of the founding fathers of modern conservation and his vision, passion, and integrity continue to inspire readers today.