Perhaps the greatest tribute ever given to Muir took place in a private conversation between two great contemporary mountaineers. Galen Rowell once asked Rheinhold Messner why the greatest mountains and valleys of the Alps are so highly developed, why they have hotels, funicular railways, and veritable cities washing up against sites that, in America, are maintained relatively unencumbered by development. Messner explained the difference in three words. He said, “You had Muir.”