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The Burj Khalifa
The Burj Khalifa (برج خليفة, Khalifa5 Tower in Arabic, pronounced [bʊɾʤ χalifæ] by AFI, or Castilian Burch Khalifa), known during construction as Burj Dubai (Dubai Tower برج دبي in Arabic), is a skyscraper that is located in Downtown Burj Khalifa district of the city of Dubai, United Arab Emirates, and is the tallest structure built by man with 828 meters high. Constructionbegan on 21 September 2004, and was officially inaugurated on 4 January 2010.6
The Burj Khalifa is the center of the development known as Downtown Burj Khalifa (formerly Burj Dubai Downtown, "Burj Dubai Center" in Spanish), a complex of 2 square kilometers beside Sheikh Zayed Road, which crosses the city ​​transversely. The architect of the project editor is Adrian Smith, who worked with Skidmore,Owings and Merrill (SOM) until 2006. Construction of the Burj Khalifa had a budget estimated at more than 4,000 million, which increased to 20,000 million for the full development of the Downtown Burj Khalifa.

The Towers of Abraj Al-Bait
The Towers of Abraj Al-Bait. They are located in the center of Mecca, in Saudi Arabia. It is the largest building ever built in the world (in size by mass), thetallest building in Saudi Arabia and the second highest in the world with 601 meters high.
The structure is located across the street from the entrance to the Masjid al-Haram in whose interior is the Kaaba, considered by Muslims the holiest site. For this reason, the towers of Abraj Al-Bait have a space for prayer, with a capacity for nearly four thousand people. Furthermore, the tallest towercontains a five-star hotel to help accommodate the more than two million pilgrims who participate in hajj every year.
The project's tallest tower will stand as the tallest building in Saudi Arabia, and the tallest and largest hotel in the world, with a height of 601 meters (1,972 feet.'s The fourth tallest building under construction. Following its official opening the structure will have aconstruction area larger than any other structure in the world with 1,500,000 m2 (16,150,000 ft2) of built area.
The One World Trade Center
The One World Trade Center, formerly known as the Freedom Tower or Freedom Tower, is a skyscraper under construction in Lower Manhattan, New York, United States by architects David Childs and Thomas Boada. This building, at a cost of two billion dollars, will bethe tallest skyscraper of the new World Trade Center complex, replacing the former Twin Towers, destroyed by a terrorist attack on September 11, 2001.
When it opened in 2013 (according to their website), will have a height of 541 meters, the third highest in the world after Burj Khalifa, 828 meters high and the Abraj Al Bait Towers of 601 meters in Saudi Arabia . The height of the building willhave a very particular symbolic feature, as its 541 meters is equivalent to 1,776 feet, a figure that turns out to be the year of independence of the United States (July 4, 1776). In addition, the roof of the building will be located at 417 meters above sea level, the exact height of the former Twin Towers. On 30 April 2012 the tower was raised officially as the tallest skyscraper in New York at aheight of 387 meters, surpassing the Empire State Building with 381 meters high.

Taipei 101
Taipei 101 is a building with 106 floors (5 floors underground and 101 above ground level), located in Taipei (Taiwan). The needle that crowns its 509 meters high it the fourth tallest skyscraper in the world.

New Year Fireworks 2008 in Taipei 101
The Taipei 101 has 101 stories above ground level(hence its name), and 5 floors subterráneos.1
The skyscraper bore the following brands:
Height from floor to the structural top: 509 meters (previously surpassed the Petronas Twin Towers sported with 452 meters).
Height from the ground to the roof: 448 meters (previously surpassed the Sears Tower boasted with 443 meters).
Height from floor to the top floor occupied: 438 meters (surpassed the...