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Grand Canyon, USA -

Walking over the edge of the Grand Canyon on a glass-floored walkway isn't for the faint of heart. The horseshoe-shaped walkway is about 70 feet (21 m) out the canyon rim, and 500 to 800 feet (152 to 244 m) above the Colorado River.

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Aurlandsfjord, Norway -

Made of Scandinavian timber and comprised of stylish curving lines, this viewing point overlooks western Norway's majestic Aurlandsfjord from a height of more than 2,000 feet (610 m).

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Iguazu Falls, Brazil and Argentina -

A series of 270 waterfalls along the border of Argentina and Brazil, the Iguazu Falls are truly breathtaking. But the suspended walkway above the surging waters, as they tumble over 820 feet (250 m), can feel a bit unsettling.

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Shilinxia Scenic Area, China -

Located on the main peak of Shilin Gorge, this circular glass viewing platform hangs over 107 feet (32.8 m) above the cliff. And it's found 1,312 feet (400 m) above the bottom of the gorge.

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Willis Tower, USA -

Formerly known as the Sears Tower, Willis Tower offers an incredible view over Chicago. Located on the 103rd floor, the glass-cubicle balconies extend out some 1,353 feet (412 m) above the pavement.

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Columbia Icefield Skywalk, Canada -

Situated midway between Jasper and Banff National Parks, the Columbia Icefield Skywalk is a glass-floor observation platform overlooking a 918-foot (280-m) drop.

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Sky Tower, New Zealand -

Taking a stroll along a footpath that's nearly four feet (1.2 m) wide doesn't sound so bad. Unless you're 632 feet (193 m) above the streets of Auckland.

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Dachstein Glacier, Austria -

Known as the "Stairway to Nothingness," this precarious perch 9,000 feet (2,743 m) up in the Austrian Alps isn't recommended for acrophobes (i.e. those afraid of heights).

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Langkawi Sky Bridge, Malaysia -

Located at the peak of Gunung Mat Cincang, this 410-foot (125-m) curved bridge hangs 2,170 feet (660 m) above sea level.

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5 Fingers Platform, Austria -

Named after its unique hand-like shape, the 5 Fingers in the Dachstein Mountains reaches out 1,300 feet (396 m)over Hallstatt. Cool, yet creepy!

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Zhangjiajie Glass Walk, China -

Hanging off the side of the Tianmen Mountains, this glass skywalk isn't to be messed with. Situated 4,700 feet (1,432 m) above sea level, don't be surprised if you tremble...

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AlpspiX Viewing Platform, Germany -

At the base of Germany's Alpspitze mountain, the AlpspiX is a glass-walled platform that can look 3,281 feet (1,000 m) down into the valley.

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British Airways i360, England -

The British Airways i360 in Brighton is the world's tallest moving observation tower. At 531 feet (162 m), visitors gets to enjoy 360-degree views over the seaside town and the English Channel.

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Cliffwalk, Canada -

The Cliffwalk is a 700-foot (213-m) walkway above the Capilano River in British Columbia. The highest point is 300 feet (90 m) above the river.

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EdgeWalk CN Tower, Canada -

Located at a height of 1,168 feet (356 m), the EdgeWalk in Toronto allows visitors to walk around the edge of Canada's tallest structure.

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First Cliff Walk, Switzerland -

This elevated walkway is perched to the side of a mountain at about 6,500 feet (2,000 m). Whatever you do, don't look down!

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Globen SkyView, Sweden -

Found on one of Sweden's biggest arenas, visitors can travel up the globe inside a globe. The two rails travel up 426 feet (129 m) and back in 20 minutes.

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Kinzua Skywalk, USA -

The Skywalk in Pennsylvania's Kinzua Bridge State Park extends 624 feet (190 m) into the Kinzua Gorge. Glass panels allow visitors to peer into the gorge below.

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Longgang Viewing Platform, China -

The horseshoe-shaped viewing platform extends 88 feet (26 m) from a mountaintop in China’s Chongqing region. With glass floors, it offers a terrifying view 2,355 feet (717 m) below.

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Melbourne Skydeck, Australia -

Located at the Eureka Tower in Melbourne, the observation deck occupies the entire 88th floor. And at 935 feet (285 m), it's the highest public vantage point in a building in the Southern Hemisphere.

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Shanghai Skywalk, China -

At the 88-story Jin Mao Tower in Shanghai, visitors are able to walk around a walkway outside the building. The platform is four-feet (1.2-m) wide and 1,115 feet (340 m) above the city.

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Messner Mountain Museum Corones, Italy -

Embedded within the summit of Mount Kronplatz, the platform of this futuristic museum is located 7,463 feet (2,275 m) above sea level.

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OUE Skyspace LA, USA -

Visitors to OUE Skyspace in LA are able to coast down the SkySlide, a glass chute attached to the outside of the building. Going from the 70th floor to the 69th, you're 1,000 feet (304 m) over ground.

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OCBC Skyway, Singapore -

The OCBC Skyway is located in Singapore's Gardens by the Bay, a 16-story high vertical garden. The Skyway is a 400-foot (121-m) walkway that links the two largest trees.

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Step into the Void, France -

This five-sided glass structure, located at the top of the Aiguille du Midi mountain peak, is found at an altitude of 12,604 feet (3,842 m).

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The View from The Shard, England -

The tallest building in Western Europe, The Shard in London has an open-air observation deck that offers 360-degree views at a height of 800 feet (244 m).

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Top of the Rock, USA -

On top of the Rockefeller Center one can enjoy the Big Apple from terrifying heights. The observatory has three levels, with the highest one being 800 feet (243 m) above ground. 

See also: The world's highest capital cities 

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