These destinations are identified as the "Top Skywalks (a.k.a. Places Not to Look Down)" by the members and editors of VirtualTourist.com. www.virtualtourist.com
AT SKYDECK CHICAGO
At 1,353 feet in the air, the Ledge's glass boxes extend out 4.3 feet from the Skydeck on the 103d floor of Willis Tower. www.theskydeck.com
AT GRAND CANYON WEST
AT THE CN TOWER
Walk the circumference of
the tower's main pod along
a 5-foot-wide ledge, 1,168 feet above the ground in Toronto (pictured).
ON TIANMEN MOUNTAIN
The glass pathway, 4,691 feet in the air, runs alongside
the mountain, in China's
Zhangjiajie National Forest Park, in Hunan Province.
SKY WALK 100,
The 100th-floor observation deck provides views of Shanghai and the Huang Pu River. www.swfc-shanghai.com