The crazy forgotten plan to build a 10,000 metre skyscraper which could house 30m people
The mind-boggling idea never got off the ground in the end but would have resulted in a structure higher than Mount Everest.
Seeing jumbo jets flying past your bedroom window at 30,000 feet could have been a reality if this insane megastructure skyscraper taller than Mount Everest had ever got off the ground.
The enormous building, dubbed the Tokyo Tower of Babel, was conceived in the 90s by Japanese Professor Toshio Ojima of Waseda University.
In the Book of Genesis story, the Tower of Babel is a parable of how humanity once all spoke the same language and starting building a city together to reach the top of the sky.
Seeing the tower, God makes it so the people can no longer understand one another, and so they scatter to every corner of the Earth. Modern scholars believe the story may be linked to a real building in antiquity possibly at a site in modern-day Iraq.
Professor Ojima's Tokyo version of the tower also envisaged bringing many people together, with over 30 million planned to be housed in the structure.
Living in a 33,000-foot-tall building may have meant residents would have to deal with altitude sickness if the interior of the upper floors was not pressurised like an aircraft, and they would possibly need oxygen piped onto the higher levels.
Outside temperatures would also be an unbearable -55C, so it's unlikely many people would want a stroll on a balcony.
The footprint of such a tall and heavy structure would have been massive with the base covering an area of 42 square miles, according to Malevus.com.
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Such a giant construction project, effectively building a mountain in a city, would have required huge resources and trillions of pounds in investment. Developers projected it would take 100 to 150 years to complete.
A financial slow down in Japan from the mid-1990s meant plans for the Tokyo Tower of Babel were never acted upon, and perhaps just as well, estimates in 2010 placed the cost of the building at at around 23 trillion pounds.
Malevus projected it would have cost more than six times the entire economic GDP of Japan.