Skywalk over Grand Canyon: world's highest man-made structure

The Hualapai tribe just opened a cantilevered walkway 4,000 feet above the Grand Canyon, called Skywalk. The attraction is part of a tourist park, and opens to the public on March 28.

Link to a series of photos shot Tuesday at a preview opening (at left, here, an artist's rendition from the original project plans). Link to a promo video, which claims it's the highest man-made structure in the world.