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Burj Khalifa: NASA astronaut shares stunning image of world's tallest building from spaceIndia, Feb. 4 -- UAE's Burj Khalifa is currently the tallest structure in the world and NASA astronaut Donald Roy Pettit recently shared a breathtaking image of the building from space ...
Standing at the base of the Great Pyramid, it is hard to imagine that this monument—which remained the tallest building in the world until early in this century—was built in just under 30 years.
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