Climbers ascend Mount McKinley in Denali National Park and Preserve, Alaska, USA

Climbers ascend Mount McKinley in Denali National Park and Preserve, Alaska, USA

© Luke Humphrey

Climbers ascend Mount McKinley in Denali National Park and Preserve, Alaska, USA

Climbers ascend Mount McKinley in Denali National Park and Preserve, Alaska, USA

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