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The X-Seed 4000 was a concept for a megatall skyscraper. [1] Its proposed 4-kilometre (2.5 mi) height, 6-kilometre-wide (3.7 mi) sea-base, and 800-floor capacity could accommodate 500,000-1,000,000 inhabitants. This structure would have been composed of over 3 million t (3.3 million short tons) of steel.
This is a list of buildings and other structures that have been envisioned. The X-Seed 4000 is one of the tallest structures ever conceived. Shown in this image is the Burj Khalifa (828 m (2,717 ft)), tallest structure in the world at the time of completion in 2010 to this year (2025), and the X-Seed 4000 project (4,000 m (13,000 ft)).
This is a list of all megatall skyscrapers, which are skyscrapers that are at least 600 m (approximately 1,968 feet) tall. [1] As of January 2025 [update] , only four completed buildings are 'megatall'.
Tallest building in East Asia and China and contains the highest luxury hotel in the world; Tallest twisted building [17] 4 The Clock Towers: 601.0 1,972 120 (+ 3 below ground) Mecca Saudi Arabia: 2012 Tallest building in Saudi Arabia, tallest clock tower and contains the highest museum in the world [18] 5 Ping An International Finance Centre ...
The Tokyo Skytree in Tokyo, Japan has been the tallest tower since 2012.. This list includes extant structures that fulfill the engineering definition of a tower: "a tall human structure, always taller than it is wide, for public or regular operational access by humans, but not for living in or office work, and which is self-supporting or free-standing, meaning no guy-wires for support."
When completed in 1973, 2 World Trade Center (the South Tower) became the second tallest building in the World – behind its twin, 1 World Trade Center (the North Tower). The South Tower's rooftop observation deck was 1,362 ft (415 m) high and its indoor observation deck was 1,310 ft (400 m) high. [ 4 ]
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The building has a total of ten elevators; owners will share a hallway with at most one other apartment. The developers also figured a generator on the ninth floor into the plans. [14] There are eight full-floor apartments at the top, ranging from 5,200 to 6,400 sq ft (480 to 590 m 2), with 14-to-19 ft-high (4.3-to-5.8 m) ceilings. [14]