People walk on the Skywalk during the First Walk event at the Grand Canyon on the Hualapai Indian Reservation at Grand Canyon West, Ariz., Tuesday, March 20, 2007. The Skywalk opens to the general public on March 28. For $25 plus other fees, up to 120 people at a time will be able to look down to the canyon floor 4,000 feet below, a vantage point more than twice as high as the world's tallest buildings.
(Photo: AP Photo/Ross D. Franklin)
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