X-Seed 4000
The X-Seed 4000 is the tallest building ever fully designed for a building proposal. At 4,000 meters high (13,123.2 feet), It would be 6,000 meters in diameter at the base and would contain 800 floors. It would likely be built in Tokyo, Japan. It was designed by the Taisei Construction Corporation as a mountain-shaped, futuristic environment in which 500,000 to 1,000,000 people could live, purposely combining ultra-modern living with interaction with nature. It will be powered by solar energy, and it will be able to react to the weather conditions outside to keep the light, temperature, and air pressure the same inside. Due to its enormous size, the only place where it was plausible to build it is in the sea. If realized, it would even be taller than Mount Fuji, Japan's tallest mountain, which is 3,776 meters high (12,388 ft).
The world's first man-made mountain is estimated to cost several hundred billion dollars, the yearly budget of many well-to-do countries. [1]
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