Rising 4,000ft (1,220m) from the canyon's floor and 70ft (20m) beyond its rim, the Skywalk is being described as an engineering first.
Las Vegas businessman David Jin raised the money to build the Skywalk which was given to the Hualapai in exchange for a percentage of the profits.
Dedicated on March 20 and opened eight days later, the skywalk resides at the Grand Canyon West on the Hualapai Indian Reservation in Arizona. The U-shaped observation platform is ringed by all-glass flooring and is suspended 4,000 feet above the Colorado River.
The Grand Canyon, long a symbol of the grandeur of America's landscapes, is more than 200 miles long.
Construction of the Skywalk began in March 2004 - and will open to the public on 28 March with 120 people allowed on the platform at any one time.