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Burj Khalifa, also known as Burj Dubai, is the world's tallest structure with the tip standing at 830m! The building consist of 154 usable floors + 9 maintenance levels + 2 underground parking levels. There are 57 lifs, 2 observation decks (124th and 148th floor), 1 swimming pool (76th floor), 1 restaurant (122nd floor), and a nightclub (144th floor)...and 24.348 glass windows! The construction took 6 years (06 JAN 2004 - 04 JAN 2010)