'Grand Canyon Skywalk' scheduled to open January 1, 2006 on the Hualapai Indian Reservation. Juts out about 70 feet into the canyon, 4000 ft above the Colorado River... Will accommodate 120 people comfortably... Built with more than a million pounds of steel beams and includes dampeners that minimize the structure's vibration... Designed to hold 72 million pounds, withstand an 8.0 magnitude earthquake 50 miles away, and withstand winds in excess of 100 mph... Has a glass bottom and sides...four inches thick.