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The Tallest Building In The World That Was Never Built — the X-Seed 4000 — was a jaw-dropping proposal for a 4,000-meter megastructure towering over Tokyo, Japan. Taller than Mount Fuji and designed to house up to one million people, this visionary skyscraper remains one of the most ambitious unbuilt projects in architectural history.

In this video, we break down the X-Seed 4000’s mind-blowing design, its impossible scale, and the engineering challenges that kept it from becoming reality. Why was this futuristic arcology never constructed, and what can it teach us about the future of mega-cities and architecture?

If you’re fascinated by futuristic skyscrapers, unbuilt megastructures, and visionary architecture, this is a story you won’t want to miss.

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