The Burj Khalifa in Dubai is currently the tallest manmade structure in the world at 829.84 m (2,723 ft). It holds numerous records including the highest number of stories, the tallest free-standing structure, and the highest observation deck. The design was inspired by the Hymenocallis flower and it took over 22 million man-hours and materials including 110,000 tons of concrete and 55,000 tons of steel rebar to complete construction. The Burj Khalifa also has the fastest elevators in the world that can travel at 65km/hr and houses over 12,000 residents across its 6 million square feet of space.