A few weeks ago, we showed you a terrifying Alpine tourist attraction called "Step Into the Void." It's a glass cage that hangs more than 3,300 feet above the mountains. But the Void is hardly the first heart-stopping skywalk—in fact, these are dozens out there that are just as scary.

I'm not afraid of heights, but I don't know how would I react to "Step Into the Void." Experts say that our brains get a bit confused in such environments, and often need some time to acclimate to the new, physics-defying situation it's in. Even if you're not near the Alps, you can test yourself below—we've collected 14 more or less similar skywalks from around the globe. Enjoy the view!

Spectators look at the city from a walkway perched a dizzying 268 meters (880 feet) up a landmark downtown tower in Sydney, Australia. The "Skywalk" is a 160-meter (525 feet) circuit running around the Sydney Tower.

Photo: Skywalk/AP

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Tourists walk on the Grand Canyon Skywalk. Operated by the Hualapai Indian tribe, at 1219 m (4000 ft), the Grand Canyon Skywalk is the second highest glass floor on Earth.

Photo: Darrin Bush, Las Vegas News Bureau/AP


Here's the view down from the glass floor extension of the Calgary Tower, a 191 m (626 feet) tall free-standing observation tower in downtown Calgary, Alberta, Canada.

Photo: Marilyn Peddle

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A visitor to the glass Skywalk at the top of the 158 meters (519 ft) high Blackpool Tower in Blackpool, UK.

Photo: Christopher Furlong/Getty Images


Looking down through the glass floor of the 170 m (560 ft) high Spinnaker Tower in Portsmouth, UK.

Photo: James Maskell


Here, a girl looks down from "The Ledge," Chicago's 442 meter (1450 ft) high Willis Tower. The glass balcony is suspended 1353 feet in the air and juts out four feet from the Sears Tower's 103rd floor Skydeck.

Photo: Kiichiro Sato/AP


And here's the glass cage named "Pas dans le Vide" (Step into the Void) at the top of the Aiguille du Midi peak (3842 meters high or 12,604 feet) that I mentioned earlier. Visitors can enjoy the view of Mont Blanc, Europe's highest mountain, from the platform, which just ousted the Grand Canyon Skywalk as the highest glass floor above ground on Earth.

Photo: Alexis Moro/AP


Here's the view from the first floor of the 540 meter (1772 ft) tall Ostankino TV Tower, Moscow, Russia.

Photo: Andrey Belenko


The Southern Hemisphere's highest glass cage viewing platform can be found in the 297 meter (975 ft) high Eureka Tower, located in the Southbank precinct of Melbourne, Victoria, Australia.

Photo: Eureka Skydeck 88/Facebook


The glass floored corridor of the Shanghai World Financial Center observation deck puts visitors above the city at 474 meters (1555 ft).

Photo: Kenneth Moore


A view through one of the two "look down windows" on the first floor of the Main Observatory at the 333 meter (1093 ft) high Tokyo Tower.

Photo: Torsodog/Wikimedia Commons


Looking straight down from 350 meter (1,148 ft) observation deck of the 634 m (2080 ft) tall Japan Skytree in Sumida, Tokyo, Japan.

Photo: Pasha C


Here's the terrifying glass floor section of the 468 meter (1535 ft) high Oriental Pearl Radio & TV Tower in Shanghai, China.

Photo: Jornny Liu


Looking through the glass floor section of the 553 meter (1815 ft) CN Tower observation deck, in downtown Toronto, Ontario, Canada.

Photo: Nic Redhead


Bonus treat: if you're not thrilled inside the CN Tower, you can take a tethered walk on the Edge Walk, on a five-foot-wide ledge that's 1168 feet (356 meters) off the ground.

Photo: CN Tower/Facebook


Top photo: Charlotte Morrall