Here comes another big one (structural tower)

[JAE]

How high can you build them?
Depends on the materials and logistics alone I guess:

https://www.yahoo.com/travel/saudi-tower-184530075.html

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[JohnRBaker]

Of course these towers are also tourist attractions due to their height with many allowing the public access to observation levels at or near the top of the structures. Note that while I never did make it to the top of the World Trade Center, I have been to the observation levels of several TALL buildings/structures around the world including the Sears Tower (1354 ft - Chicago), Petronas Towers (1230 ft - Kuala Lumpur), Empire State Building (1224 ft - NYC), Eiffel Tower (896 ft - Paris), Rialto Towers (768 ft - Melbourne), Renaissance Center (696 ft - Detroit), Gateway Arch (630 ft - St. Louis) as well as few other edifices, which is pretty good for a guy who suffers from acrophobia (actually, glass elevators are the worse).

John R. Baker, P.E.
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To an Engineer, the glass is twice as big as it needs to be.

 

[ornerynorsk]

(actually, glass elevators are the worse)

Yes. They. Are. CN Tower in Toronto, 1st observation deck 1135 ft. Entrance into the elevator is made from the gift shop, if memory serves, so it was not readily apparent that the glass door I was pressed up against would be fully exposed and on the edge of the wild blue yonder for the duration of the ride. My nerves still tingle just thinking about it.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[msquared48]

I hate the platforms or elevators with the glass floors with the cracks in them. The cracks prevent you from seeing the view!

Mike McCann, PE, SE (WA)

 

[Trenno]

Interesting that this one seems to have the green light.

Unlike many others that have come before it and failed to launch.

I know my boss was involved in the schematic stage of the Nakheel Tower (1400m or 4600ft), but it fell through...

http://www.woodsbagot.com/wp-content/uploads/2013/08/Tall_Tower_N20.jpg

 

[FishTheStructure]

The structural form looks to replicate that of the CN tower.

Great spirits have always encountered violent opposition from mediocre minds - Albert Einstein