The Grand Canyon Skywalk — Go Here
Grand Canyon West is privately owned by the Hualapai tribe, and it was they who conceived of and now operate the Grand Canyon Skywalk -- A transparent, horseshoe-shaped cantilever bridge in Arizona that allows you to get a feel for just how gigantic the Grand Canyon truly is, by scaring the life out of you.
At 4,770 ft elevation, this area of the canyon is is 3,610 feet above the Colorado River, which runs nearby. The drop directly under the skywalk varies in different sections from 500-800 feet. (WHAT IF IT BROKE WHILE WE WERE ON IT? Never. Never ever never.)
Approximately 120 miles from Vegas, the Skywalk was finished in 2007, and extends 70 feet over the cliff into the terrifying open air. The Skywalk was specifically designed for a 100-pound-per-square-foot load, in addition to wind and seismic requirements. This means that the foundation of the Skywalk is strong enough to hold 70 fully passenger-loaded Boeing 747 aircrafts, and sturdy enough to withstand an 8.0 richter earthquake within 50 miles of it's location. We're still not comfortable, but it makes is feel a little less panicky.
Supposedly it can hold a total of 822 200-pound people, but thankfully they only let 120 on at a time. On the site they say that "at the time of roll-out," the Skywalk weight about 1.6 million pounds. Why...would it weigh something different now? Is it disintegrating?
Buzz Aldrin and John Herrington were both on hand for the opening ceremony on March 20, 2013. You can't tell, but this is them, below. You also can't tell, but $10 says they were terrified.