1Half Dome Stairs, California, USA

Rising nearly 5,000 feet above Yosemite Valley and 8,800 feet above sea level,

..Half Dome is a Yosemite icon and a great challenge to many hikers. Today, thousands of people reach the summit. For most, it is an exciting, arduous hike; for a few, it becomes more of an adventure than they wanted. Indeed, park rangers assist hundreds of people on the Half Dome trail every summer. Most of these emergencies could have been prevented.

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