The Grand Canyon's Skywalk has been inaugurated with hundreds of invited guests getting stunning views over the canyon through its glass walkway. 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. The Hualapai Indians, who own the site, are hoping to attract visitors to a high unemployment area. But some tribal mem