6. World's Tallest Buildings

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Dubai's Burj Khalifa is over 2,700 feet high and the tallest building in the world, and as engineers race to top this record-setting height, a new 3,200-foot-tall building in Saudi Arabia is poised to take the crown.

5. Cities in the Sky

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Today's greatest skyscrapers use cutting-edge tech to build sky-high micro-cities within their walls, and these innovative mega-builds are becoming the new engineering icons in twenty-first century metropolises.

4. The New Colossus

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The rise of colossal towers across the planet coincided with the surge of cutting-edge design, but just as these monoliths began breaking world records, new threats were on the horizon.

3. Rise of the American Titans

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The World Trade Center and the Sears Tower were record-setting skyscrapers made possible by engineering innovations, but just as these American icons set new standards in construction, dark forces were poised to undo it all.

2. New York's Greatest

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The world's most iconic buildings were built in the heyday of the American century, and as New York became the capital for these innovative new skyscrapers, experts used cutting-edge tech to push engineering to new heights.

1. American-Made Marvels

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The emergence of the skyscraper coincided with the rise of America as a global superpower, and experts reveal how expert engineering and cutting-edge technology helped power humankind's race to conquer the sky.

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