Race is on to build world's tallest structure

From pyramids to skyscrapers, countries still trying to outdo each other

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How many structures have qualified as the tallest thing ever built? Surprisingly, it’s a pretty small club.

We don’t know much about structures of the distant past, of course. But we do know that if you’d been hanging around Giza in 2570 B.C. or so, you’d have found the spanking-new Great Pyramid soaring some 481 feet into the sky — high enough to hold the title of tallest manmade structure for nearly 4,000 more years.