DENALI NATIONAL PARK, AK - MAY 17: An aerial view of Mt. McKinley (top center) and the Wickersham Wall on May 17, 2014 in Denali National Park, Alaska. According to the National Park service, the summit elevation of Mt. McKinley is 20,320 feet above sea level, making it the highest mountain peak in North America. (Photo by Lance King/Getty Images)
