Top 10 Tallest Buildings in the World

10. Willis Tower

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When the Willis Tower (still commonly known as the Sears Tower) completed construction in 1973, it was known as the tallest building in the world. Now, that's not so much the case anymore. It still remains an important landmark for the city of Chicago. It stands 1,450 feet.

9. Zifeng Tower

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This Chinese skyscraper completed construction in 2010. The tower includes office spaces, restaurants, and hotels. It stands 1,476 feet.

8. Petronas Towers

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Although they are no longer the tallest buildings in the world, they still remain the tallest twin towers in the world. Located in Malaysia, they both stand at 1,483 feet.

7. International Commerce Centre

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Located in Hong Kong, this 1,588 foot skyscraper has 118 floors and took 8 years to complete before opening in 2010. Six workers were killed during construction.

6. Shanghai World Financial Center

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Known for its intricate, curved architectural design, the Shanghai World Financial Center is 1,614 feet and cost about 1.2 billion dollars to complete. The architecture won many awards at the time of its completion in 2008.

5. Taipei 101

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Completed in 2004, it was the world's tallest skyscraper for 6 years before being outsized in 2010 by the current number 1 skyscraper. Used for office space, the building stands at 1,670 feet.

4. One World Trade Center

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As a way of commemorating the lives lost during the September 11 attacks, the 1 WTC began construction in 2006 and has recently opened. The building was designed by the firm of Skidmore, Owings & Merrill and cost almost 4 billion dollars to complete. It is destined to become another national landmark.

3. Mecca Royal Hotel Clock Tower

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Also known as "Abraj Al Bait," the clock tower was completed in 2012 and is 1,971 feet tall. It also holds the titles of "world's tallest clock tower" and "world's largest clock face." It is located in Mecca, Saudi Arabia.

2. Shanghai Tower

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One of two towers to reach over 2000 feet, this tower is estimated at being completed some time in 2014. Designed by the American firm Gensler, the building will have over 120 floors.

1. Burj Khalifa

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At 2,722 feet, the Burj Khalifa in Dubai is the world's tallest tower. It has 163 floors and the building has a variety of uses. The official launch in 2010 was met with a celebration of fireworks and light sequences. The architecture has won many awards, including an International Architecture Award in the same year the building was launched. It may be years before another building surpasses it.