Currently in the design phase, this project could very well turn into a reality once they iron out the engineering quirks. Envisioned by Japan’s Taisei Construction Company, the X-Seed 4000 will top Mt. Fuji by 700 feet. It will contain 800 floors and house 1 million people. Looking at the pictures on Inventorspot.com, I’m reminded of the covers of old science fiction and fantasy novels. Very otherworldly.