The two tallest buildings in the world are the Burj Khalifa in Dubai, UAE and the Makkah Royal Clock Tower in Mecca, Saudi Arabia.

世界上最高的两栋建筑是阿联酋迪拜的哈利法塔和沙特阿拉伯麦加的麦加皇家钟楼。

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The Empire State building is one of the tallest buildings in the world.

帝国大厦是世界上最高的大厦之一。

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Soaring above the New York skyline, the Twin Towers were among the tallest buildings in the world.

“双子塔”高耸入云，曾是世界上最高的建筑之一。

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Today we look up into the skies to explore the past and present of the tallest buildings in the world.

VOA: special.2010.03.31

The twin skyscrapers were the tallest buildings in the world at the time, only overtaken by the Taipei 101 in 2004.

BBC: Profile: Skydiver Felix Baumgartner

Of the top 10 tallest buildings in the world right now, the only U.S. property is the Willis Tower (Sears Tower) in Chicago standing at 1, 451 feet.

FORBES: China's Tallest Building Gets Even Bigger

When the new Freedom Tower is complete in lower Manhattan, it will be one of the top five tallest buildings in the world with a total peak height of 1, 776 feet.

FORBES: China's Tallest Building Gets Even Bigger