Pictures: Burj Khalifa, the world's tallest building

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Dubai's Burj Khalifa tower, the world's tallest skyscraper, is lit by laser lights during its opening ceremony in the Gulf emirate. (MARWAN NAAMANI/AFP/Getty Images)

Burj Khalifa Tower

Dubai's Burj Khalifa tower, the world's tallest skyscraper, is lit by laser lights during its opening ceremony in the Gulf emirate. (MARWAN NAAMANI/AFP/Getty Images)