Climbers sign up to top Mount McKinley: Half who start don't reach the summit.

In the 95 years since Walter Harper became the first person to stand on North America's rooftop, 16,769 climbers have enjoyed the view from the top of Mount McKinley. Tourists take in Mt. McKinley from the Eilson Visitor Center in Denali National Park in Alaska. Mount McKinley in Denali National... [read full story]