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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 second tallest building ever fully envisioned after the X-Seed 4000. If ever constructed, the Dubai City Tower will be much taller than any other current man-made structure.
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 have 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.[Wikipedia]
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Hoover Dam, originally known as Boulder Dam, is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Arizona and Nevada. When completed in 1935, it was both the world's largest electric-power generating station and the world's largest concrete structure. It was surpassed in both these respects by the Grand Coulee Dam in 1945. It is currently the world's 35th-largest hydroelectric generating station.[Wikipedia]