Mountain Madness interests. While leading Mountain Madness, Fischer became renowned for his ascents of the world's highest mountains made without the use of supplemental oxygen. Fischer and Wally Berg were the first Americans to summit Lhotse, the world's fourth highest mountain (27,940 feet / 8516 m), located next to Mount Everest. He and Ed Viesturs were the first Americans to summit K2, (28,251 feet / 8611m) in the Karakoram of Pakistan without supplemental oxygen. During his stewardship of Mountain Madness, Fischer led social and environmental initiatives to help people in the countries in which Mountain Madness traveled. As the leaders of the
Central Karakoram National Park big sheer rock walls, and trek. Most expeditions visit the region in July and August, but some come as early as May and June, and September can be good for lower altitude climbing. One celebrated climbing area is Trango Towers, a group of some of the world tallest rock towers, situated in the park close to the route used to trek to the K2 base camp. Every year, a number of expeditions from all parts of the world visit the area to climb these most challenging granite towers. Central Karakoram National Park Central Karakoram National Park () is a national