A few members of the Hualapai Indian Tribe, which allowed the Grand Canyon Skywalk to be built, hopped up and down on the horseshoe-shaped structure.
At its edge -- 21 metres beyond the rim -- the group peeked over the glass wall.
"I can hear the glass cracking!" Hualapai chair Charlie Vaughn said playfully.
Former astronaut Buzz Aldrin declared it a "magnificent first walk."
The Hualapai, whose reservation is about 145 kilometres west of Grand Canyon National Park, allowed Las Vegas developer David Jin to build the US$30 million Skywalk.
The hope is to create a unique attraction on their side of the canyon.
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