The Dubai City Tower, also known as the Dubai Vertical City, is a proposed supertall skyscraper design announced on 25 August 2008. The supertall, created by an architect to display possibly future technologies, is the third tallest building ever fully envisioned after the X-Seed 4000 (4000m) and the Ultima Tower (3217m). If ever constructed, the Dubai City Tower will be much taller than any other current man-made structure, at almost three times the height of the Burj Khalifa. The Dubai City Tower would be almost seven times taller than the Empire State Building. The design has 400 floors with a 200 km/h (125 mph) vertical bullet train acting as the main elevator. The design is inspired by the Eiffel Tower to better deal with the massive wind forces pushing on it. It has a central core with 6 outer buildings that are connected to the central core every 100 floors. This design both stabilizes the structure and spreads out its mass.[Source]