Looking 4,000 feet straght down to the Colorado River, every brain cell in your head screams "Freeze! Don't Take another step!"

    Yet you do anyway, stepping out seemingly onto air. The experience of walking on the Grand Canyon Skywalk is both exhilerating and terrifying, as you step out onto clear glass, frosted on the sides, high in the sky where only eagles dare to soar.

    Completed in 2007 after 2-1/2 years and $30 million, the Skywalk is an engineering marvel, a one-of-a-kind, glass bottom, cantilever bridge that weighs over 1-1/2 million pounds. Built to support in excess of 71 million pounds of weight on top of it--the equivalent of 71 fully-loaded 747's piled on top of each other--your mind tells you that the Skywalk will surely support your weight...but looking down into the vast expanse of sky below you, the eyes say differently.

    So when many people step out onto Skywalk, they stay near the frosted glass on the sides, avoiding the clear section in the middle that lets the view spill upwards. Guests wear protective booties on their adventure to make sure the five layers of glass aren't scratched. Eventually you lose all perspective of high up you really are, any sense of vertigo subsides, and indeed you form a sense of camraderie with fellow daredevils.

    Getting to the Skywalk is part of the adventure. A 10-mile passable dirt road leads to the Arizona attraction overlooking the Grand Canyon, but for those who want to pass on the extra adventure of driving there, a shuttle bus does the work for you. Admission to Grand Canyon West, where the attraction is located, is $40.95 and includes admission to other nearby sites including Eagle Point, Guano Point and Hualapai Ranch, where there's cowboy demonstrations, horseback riding, shows and cabin rentals. Skywalk admission itself is $29.95.

    For details call (702) 220-8372, or visit Grand Canyon Skywalk.