人工奇迹：大峡谷天空步道:在线播放
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人工奇迹：大峡谷天空步道:最新迅雷BT资源
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人工奇迹：大峡谷天空步道:剧情介绍
Plot Summary:The episode documents the inspiration and engineering behind the construction of the Skywalk attraction at the Hualaipai Nation's \"Grand Canyon West\" village. Skywalk allows visitors to stroll out on a cantilevered bridge above a cliff, and peer directly through the glass floor to see the Grand Canyon floor 4,000 feet below their feet.