![By Newsburst (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons](http://halfapage.com/wp-content/uploads/2017/01/XSeed4000BurjDubaiComparison.jpg)
The X-Seed 4000 is a proposed structure which would be as high as a mountain (4km/2.5mi) and would be able to accommodate up to 1 million inhabitants. It was created by architect Peter Neville in 1995 in a bizarre, but effective publicity stunt for an architecture firm. The plans for this astounding building were actually completed. It would need at least 3 million tons of steel and the hefty sum of 1,000 billion dollars to build. According to Neville, the structure would have been built in Japan.
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Information sources:
https://en.wikipedia.org/wiki/X-Seed_4000
Image Sources:
By Newsburst (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons