Over 1,000 feet above the streets of Bangkok, thrill-seeking tourists creep out onto the glass floor of an observation deck at the top of a futuristic-looking tower. The new observatory is the crown jewel of the MahaNakhon building by Buro Ole Scheeren, a residential skyscraper adjacent to Chongnonsi Sky Train Station. Dubbed the “Skytray,” the sheet of glass cantilevers from the top of the building and measures about 15 by 57 feet.

The deck, which just opened to the public, offers 360-degree views of the cityscape and the Chao Phraya River. As with any skyscraper observation deck, it’s not for the faint of heart, and the glass makes it extra heart-pounding – especially since the MahaNakhon is Thailand’s tallest building.

The tower itself is a striking addition to Bangkok with a pixelated appearance generated by “a geometric erosion” consisting of balconies, terraces and floating rooms that emerge or recede from the tower’s glassy facade. The architects wanted to blur the boundaries between the tower and the city outside so residents almost feel like they could walk right out into the air. In addition to 200 private apartments, the tower houses retail space, cafes, restaurants, terraces and a boutique 150-room hotel.

“The 77-storey complex embodies a radical manifestation of the potential of the skyscraper to invigorate its urban context,” say the architects. “The design dismantles the traditional formula of an inert and hermetic totem by opening up the tower to reveal the scale of human inhabitation inside the building. Characterized by its distinctive sculptural profile and the three-dimensional pixelated ribbon that coils around its full height, the building unveils its inner life and projects the image of human activity to the surrounding city and beyond.”

Glass floors give us a glimpse at what’s beneath our feet – whether that’s the historical bones of a building, a swimming pool on the next floor, the city streets or the bottom of a canyon – while freaking us out over the potential of breakage. And yes, sometimes these glass floors really do crack, no matter how ‘unbreakable’ they’re supposed to be, including those situated hundreds of feet above the ground.

2 Glass-Bottomed Bridges in China

You’d better not be afraid of heights if you’re gonna cross this glass-bottomed bridge in China, suspended a stomach-turning 590 feet above ground level in China’s central Hunan Province. Known locally as Haohan Quiao, the bridge features glass panels measuring 24 millimeters thick, which are supposedly 25 times stronger than regular glass. But this isn’t the only such bridge in China. The second is the structure hanging 1350 feet over the bottom of Zhangjiajie Grand Canyon – and this bridge really did crack at one point under an unexpected volume of visitors, forcing its closure. This one is officially the world’s longest glass bridge.

Office in Oslo by Reiulf Ramstad

A 19th century villa gets a modern update by architect Reiulf Ramstad, while this transparent section of floor reveals the old beams hidden beneath the newer materials for a reminder of the building’s history.

Hotel Les Cols Pavellons

You’d never guess that just beyond the traditional-looking 13th century farmhouse at hotel Les Cols Pavellons in the Catalan town of Olot is a series of ultramodern glass pavilions. These ‘zen’ hotel rooms are like crystal cubes housing almost nothing but a bed, a glass table and chairs and a bath for a minimalist experience that’s all about experiencing the design.

Glass-Bottomed Sky Slide in Los Angeles

More than just a glass-bottomed observation deck, which is becoming more common all over the world, this attraction at the U.S. Bank Tower in downtown Los Angeles is a fully functioning slide that chutes guests 45 feet from a window on the 70th story to a terrace on the 69th.

Glass-Bottomed Suspended Pool in Houston

Houston is home to an awesome plexiglass pool that cantilevers 10 feet past the edge of the building, 500 feet above street level. Installed at the new Market Square Tower apartment building by Jackson & Ryan Architects, the skypool offers views of the Houston skyline, and stops passersby in their tracks on the sidewalk below.

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Your head spins, your stomach clenches, your heart pounds furiously. You’re thousands of feet above the ground with nothing but glass keeping you from teetering over the edge in a lengthy and final fall. Do you have the guts to look down? Hundreds of feet in the air, these 13 tower platforms and observation decks – often with transparent floors – offer absolutely breathtaking views of cities like Shanghai and landscape features like the Grand Canyon.

Burj Khalifa Observation Deck, Dubai

(images via: unique buildings, mithunonthe.net, le grand portage)

You’re never going to get a higher vantage point from a free-standing structure than that attainable at the Burj Khalifa observation deck in Dubai. Unless, that is, somebody builds a structure even taller than this world-record tower, which reaches half a mile into the air. The observation deck is on the 124th floor of the Burj Khalifa (formerly known as the Burj Dubai) and on a clear day, it provides absolutely jaw-dropping views of practically the whole of the United Arab Emirates.

Stockholm SkyView at the Ericcson Globe

(images via: globearenas.se)

You’ll literally feel on top of the globe when you hitch a ride in one of the glass ‘gondolas’ at Stockholm Skyview, a moving observation deck that travels up two sets of rails on the exterior of the Ericcson Globe Arena in Sweden. Each gondola can take 16 people over 426 feet into the air for an unforgettable view of the city of Stockholm.

Top of Tyrol, Austria

(images via: aste architecture)

Virtually invisible against the snow in the winter, ‘Top of Tyrol’ was designed to blend seamlessly into its environment and provide a vantage point that most people couldn’t achieve without some serious mountain climbing abilities. Designed by Aste Architecture, Top of Tyrol cantilevers nearly 30 feet out from the pinnacle of Austria’s Mount Isidor, about 10,500 feet above the ground.

Shanghai World Financial Center, China

(images via: kanegan, bernt rostad, le grand portage)

Before the Burj Khalifa came along and shattered all kinds of records, the observation deck at the Shanghai World Financial Center was about as high as it got. The glass observation corridor, which spans the summit of the building, is half a kilometer in the air – but the faint(ish) of heart can still get a thrill by checking out lower decks on the 94th and 97th floors instead.

Five Fingers Viewing Platform, Austria

(images via: goldenrochs.at)

Get five different views with five different features in each jetty of ‘Five Fingers’, a viewing platform in the Austrian Alps. The first has a picture frame for souvenir shots, the second a glass floor for that vertiginous feeling, the third a trampoline for the foolhardy (this one is only open for special events, lest tourists bounce themselves right over the cliff), the fourth a hole in the floor to peek through and the fifth, a telescope.

Sands Skypark, Marina Bay Sands, Singapore

(images via: marinabaysands.com)

On the top of three skyscrapers, 656 feet in the air, Singapore boasts a 1,246-foot-long rooftop deck by architect Moshe Safdie offering an incredible view of Marina Bay. The curving Sands Skypark is shaped like a ship and equivalent in size to the Eiffel Tower laid on its side. Among its most notable features is a 150-meter-long infinity swimming pool, which makes guests feel like they could swim right over the edge.

Landscape Promontory, Switzerland

(images via: etienne deffinis, architonic)

Designed by Paolo Burgi, Landscape Promontory is a suspended metal platform that almost looks like an insanely oversized, modern version of a carnival ride – except that it (thankfully) doesn’t move. The viewing platform extends out from Cardada mountain in Switzerland and is marked with symbols and explanations that tell of local history and literature.

Willis Tower Skydeck, Chicago

(images via: charlotte speaks)

Step out onto the deck of the Willis (formerly Sears) Tower ‘Skydeck’ – an enclosed balcony made almost entirely of glass – and you’ll feel, for a moment, as if you’re about to hurtle to a rather unpleasant death on the streets below. Or perhaps, if you’re the brave type, the height won’t phase you at all and you’ll just be completely entranced by an unparalleled, uninterrupted view of the Chicago skyline.

Aurland Lookout, Norway

(images via: todd saunders)

You know that stomach-clutching, heart-in-your-throat sensation you get on roller coasters just as you’re coming up to the edge of a terrifyingly steep drop? That moment is drawn out indefinitely at the Aurland Lookout in Norway, a stunning wooden overlook that puts nothing but a sheet of plate glass between you and the countryside below. Designed by Todd Saunders & Tommie Wilhelmsen, the minimalist structure celebrates the region’s natural beauty and exemplifies its spare, modern design sense.

Eureka Skydeck, Melbourne

(images via: eurekaskydeck.com)

They named this thing ‘Eureka’ for a reason – it’s about the tamest exclamation that would emerge from your mouth as you walk out onto it. As you look down through the glass floor, you become acutely aware of the fact that you’re nearly 1,000 feet above street level. Jutting 9 feet out the side of the building, the Skydeck offers the highest public vantage point in a building in the Southern Hemisphere.

Grand Canyon Skywalk, Arizona

(images via: vistor.com)

Stepping out onto the Grand Canyon Skywalk is probably the closest you’ll ever get to walking on air. The U-shaped walkway, considered quite a feat of engineering (or an over-developed eyesore, depending on your viewpoint), extends 66 feet from the canyon’s edge and its two-inch-thick glass floor lets you gaze down 3,600 feet to the canyon floor below.

House on the Rock Infinity Room, Wisconsin

(images via: panaramio, gadling)

As you emerge from the cluttered depths of one of America’s most bizarre roadside attractions, The House on the Rock, you can clear your head on a cantilevered viewing platform that extends 218 feet over the forest floor. Once you reach the end of the ‘Infinity Room’, which has 3,264 windows, you can look out the final pane of glass, which is set into the floor at the tip.

i360 Tower, Brighton, UK

(images via: e-architect.co.uk)

England’s Brighton Beach will get a 600-foot needle tower with a circular glass viewing platform that can hold 125 people, following years of delays. The i360 Tower – which might get a name change by the time it’s complete – is set to become Britain’s highest observation tower, granting 360-degree views of the coast.