From the top of a skyscraper in the center of the city at night, the lights of apartment buildings and office towers twinkle all the way to the horizon.

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Friday's final installation, raising the building's height to 1, 776 feet, makes One World Trade Center the tallest skyscraper in the U.S. and third-tallest in the world, although building experts dispute whether the spire is actually an antenna a crucial distinction in measuring the building's height.

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It is also well-known for its other iconic buildings including the futuristic CCTV headquarters in Beijing and the Shanghai World Financial Center, which is China's tallest skyscraper.

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