What are the tallest skyscrapers in the world ?

Question

what are the 3 tallest skyscrapers in the world with their heights ?

Answer 1

The three tallest completed skyscrapers (by architectural detail) are as follows:

1) Taipei 101 - 509 m (1671 ft)

2) Shanghai World Financial Center - 492 m (1614 ft)

3) Petronas Towers - 452 m (1483 ft)

However, there are other ranking methods.  This method counts the height of a spire but not that of an antenna; the antenna of Sears Tower rises higher than the spires of Taipei 101 and the Petronas Towers.

There are several skyscrapers under construction worldwide that would overtop the existing rankings.  They include Burj Dubai, with a planned roof height of 643 m (2110 ft); Russia Tower, with a planned roof height of 612 m (2009 ft); and the Chicago Spire, with a planned roof height of 610 m (2000 ft).

Answer 2

The tallest man-made structure is the Burj Dubai, a skyscaper still under construction in Dubai, that has reached 629 m (2,064 ft) in height as of April 7, 2008.

The CN Tower in Toronto, Ontario, Canada, standing at 553.3 m (1,815 ft), was the world's tallest freestanding structure on land from 1976 until September 12, 2007, when it was overtaken in height by the rising Burj Dubai. The tower has the world's highest public observation deck at 446.5 m (1,465 ft).

The Petronius Platform stands 610 m (2,001 ft), leading some to claim it as the tallest freestanding structure in the ocean.

Taipei 101 in Taipei, Taiwan is currently the world's tallest inhabited building in three of the four main categories that are commonly measured: at 509.2 m (1,671 ft) as measured to its architectural height (spire) as well as roof height 449.2 m (1,474 ft) and highest occupied floor 439.2 m (1,441 ft). The Sears Tower is highest in the last category: the greatest height to top of antenna of any building in the world at 527.3 m (1,730 ft).