This looks nuts.
http://www.cnn.com/2007/TRAVEL/03/21....ap/index.html
"It felt wonderful; not exactly like floating on air," said former astronaut Buzz Aldrin, who once traipsed the surface of the moon and on Tuesday became one of the first to stroll onto the Grand Canyon Skywalk, a massive glass-bottom observation deck perched 4,000 feet above the canyon's floor.
Tour packages with deck access will range in price from $49.95 to $199. The deck, which juts 70 feet beyond the canyon's edge, will accommodate up to 120 guests at a time and offer a bone-chilling vantage point more than twice as high as the world's tallest buildings.

