Where the windswept Patagonian steppe meets the Andes, and the massive unclimbed south wall of Cerro San Lorenzo looks down on the Lacteo Valley: Perito Moreno National Park is a stronghold of wild nature. In a region so alluring that is has become synonymous with beauty at the end of the Earth, Perito Moreno National Park is an icon of Patagonia. Named in honor of revered early conservationist Perito Moreno, the John Muir of Argentina, this relatively little visited park is a magnet for intrepid travelers and ambitious alpinists. Legendary businessman and philanthropist Douglas Tompkins...