1. The Ledge at Willis (Sears) Tower; Chicago, IL
This ledge extends out the side of the building and hangs 103 floors above Wacker Drive and the Chicago River.
2. Skywalk at the Grand Canyon; Arizona
This half-moon glass ledge extends 70 feet over the edge of a 2000-foot drop to the base of the canyon.
3. Edge Walk at the CN Tower; Toronto, ON
The tower stands 1,815.4 ft tall. There is an indoor lookout level at 1,135 ft and an outdoor observation level and glass floor at 1,122 ft. The most recent attraction is the Edge Walk which takes place outdoors and allows people to hang over the edge of the building at an elevation of 1,168 ft.
4. Aiguille du Midi Skywalk aka "Step Into The Void"; French Alps
This glass lookout is located at an altitude of 12,605 ft and overlooks a drop of 3,396 ft in the Mont Blanc massif in France.
5. Capilano Suspension Bridge and Cliffwalk; Vancouver, BC
If the famous 450-foot-long suspension bridge over the Capilano River isn't scary enough, you can now walk along the very narrow Cliffwalk which takes you over the canyon at treetop level.
6. Trolltunga; Skjeggedal, Norway
Translating to The Troll's Tongue in English, this ledge hangs about 2,300 ft above the north side of the Ringedalsvatnet River. This is a view you have to earn - it takes 8 to 10 hours to hike the trail to get to the top and there is no cell service or help if you get stuck.
7. Sky Bridge at Petronas Twin Towers; Kuala Lumpur, Malaysia
These are the tallest twin towers in the world standing at 88 floors (1,483 ft) each. The Skybridge is located on the 41st level, is 550 ft from street level and is 192 ft across.
8. At The Top at Burj Khalifa; Dubai, United Arab Emirates
This building holds seven height-related world records including tallest building in the world. There are two observation decks to view the city from. The first is on level 124 at 1,496 ft and offers a 360-degree view of Dubai. The second is on level 148 (1,821 ft) and includes an outdoor viewing area which is the highest in the world.