World's tallest skyscraper would reach 2.5 miles high and house 1m residents
- Posted on June 13, 2026
- By Express
- 0 Views
- 1 min read
World's tallest skyscraper would reach 2.5 miles high and house 1m residents
A concept for the world's tallest skyscraper was unveiled three decades ago but never went ahead - the X-Seed 4000 would have housed up to one million people
