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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)).
Night view of the skyline of Hong Kong, which has over 500 skyscrapers. The list of cities with most skyscrapers ranks cities around the world by their number of skyscrapers. A skyscraper is defined as a continuously habitable high-rise building that has over 40 floors [1] and is taller than approximately 150 m (492 ft). [2]
Height comparison between the X-Seed 4000 and the Burj Khalifa. 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.
Here are 10 of the tallest skyscrapers around the world that now sit empty or uncompleted — and how they ended up that way. Beirut Trade Center, Beirut (459 feet) The Burj al-Murr or Beirut ...
The history of skyscrapers in New York City began with the construction of the Equitable Life, Western Union, and Tribune buildings in the early 1870s. These relatively short early skyscrapers, sometimes referred to as "preskyscrapers" or "protoskyscrapers", included features such as a steel frame and elevators—then-new innovations that were used in the city's later skyscrapers.
A skyscraper is generally defined as any building that is more than 150 metres (492 ft) tall and has more than 40 storeys. [1] [2] The following is a list of countries with the most skyscrapers. Other structures like observation towers or lattice towers are excluded on this list.
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 February 2025 [update] , only four completed buildings are 'megatall'.
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