Though it may seem a little obscure, here is an image of the proposed 'Grand Canyon Skywalk' - part of a $30m tourist scheme designed for a new resort to the western edge of Grand Canyon National Park.
Truly gobsmacking stuff, the Skywalk will hover 3,800 feet above the Colorado River over a rim of the Grand Canyon, allowing tourists to stroll on an 80-yard walk around a semicircular platform jutting beyond the canyon rim, surrounded by a 4-inch thick Plexiglass surround that will provide a spectacular view of the canyon floor directly below. The Skywalk is projected to open around June 2006. As mentioned the attraction forms part of a new Grand Canyon West resort on the Hualapai reservation at the western edge of the park, about 120 miles from Las Vegas.
The feature is designed to accommodate up to 120 visitors at any one time (visitors who will pay $25 for the privilege) and hold 72 million pounds, withstand an 8.0 magnitude earthquake 50 miles away, and withstand winds in excess of 100 mph.
Also see -> http://www.destinationgrandcanyon.com/skywalk.html