GRAND CANYON SKYWALK - UNITED STATES
The Hualapai tribe of Arizona commissioned this horseshoe-shaped, glass walkway that opened above the Grand Canyon in 2007.
The Skywalk juts off the rim of a side canyon 4,000 feet above the Colorado River.
Despite the vertigo-inducing views, the glass bridge reportedly is very sturdy —
it can support more than 71,000 pounds and can withstand gusts of wind over 100 mph.
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