Japan's Crown Prince and Princess Akishino have visited the venue of the upcoming expo in Osaka, western Japan.

Are you afraid of heights? If so, you'll probably want to skip the Glacier Skywalk. Everyone else should consider trekking out over the U-shaped walkway, which extends over the Sunwapta Valley.

One of the more controversial additions to the Grand Canyon's surroundings, the Grand Canyon Skywalk is a large, semicircular bridge with a transparent glass floor, allowing tourists to walk out ...