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DENALI NATIONAL PARK, AK - SEPTEMBER 1: A man looks through a telescope at Denali, formerly known as Mt. McKinley, on September 1, 2015 in Denali National Park, Alaska. According to the National Park Service, the summit elevation of Denali is 20,320 feet and is the highest mountain peak in North America. (Photo by Lance King/Getty Images)

DENALI NATIONAL PARK, AK - SEPTEMBER 1: A man looks through a telescope at Denali, formerly known as Mt. McKinley, on September 1, 2015 in Denali National Park, Alaska. According to the National Park Service, the summit elevation of Denali is 20,320 feet and is the highest mountain peak in North America. (Photo by Lance King/Getty Images)