Burj Dubai is the tallest man-made structure in the world. The Burj Dubai had its name officially changed to Burj Khalifa during its grand opening in honor of the president of the U.A.E. H.H. Sheikh Khalifa bin Zayed al Nahyan. The condensation water collected from the A/C system equals to 20 Olympic-sized swimming pools per year and in turn, used for landscaping. Over 330,000 cubic meters of concrete and 31,400 metric tonnes of steel rebar was used at the completion of the tower. The tower is situated on a man-made lake which is designed to wrap around the tower and to provide dramatic views of it.