The worlds tallest building and tallest free-standing structure m- Burj Khalifa It is designed to resemble the Hymenocallis flower This took more than tons of concrete tons of steel rebar and million man-hours over years

Tags: architecture, worlds, tallest, building, free-standing, structure, burj, khalifa, designed, resemble, hymenocallis, flower, tons, concrete, steel, rebar, million, man-hours

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