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The world's tallest building is the Burj Khalifa in Dubai, United Arab Emirates. The image below shows some of the tallest buildings in the world.

A complete list of the tallest buildings
List of tallest buildings and structures in the world
List of tallest freestanding structures in the world
List of tallest structures in the world
List of tallest towers in the world

Image source: Phombo.com
New York's One World Trade Center
The building is located in the northwest corner of the site where the twin towers were destroyed in the September 11, 2001, attacks. One World Trade Center is now the tallest structure in the USA and
the third-tallest in the world - 1776 ft - or 541 meters.


Africa's tallest building could catapult continent into skyscraper big league
Centurion Symbio-City, near Johannesburg, poised to become world's 14th-tallest freestanding structure
The structure, part of a development known as Centurion Symbio-City, will soar to 447 metres, or 110 storeys, more than double the Carlton Centre and higher than the Empire State Building. It would
become the 14th-tallest freestanding structure on the planet.
Located in Centurion between South Africa's administrative capital, Pretoria, and its commercial capital, Johannesburg the development will have one residential and two office towers. It will include hotels,
shops and a convention centre and span 10 hectares of land and lake. Perhaps most strikingly, the preliminary design shows a vertical column of wind turbines embedded in the tallest tower, which includes a
rooftop garden with trees and swimming pool. It will be flanked by two others of 80 and 60 floors each. Read more here     More pictures here

More info here and here