Burj Khalifa ( Arabic : برج خليفة , `` Khalifa Tower '' ) , known as Burj Dubai prior to its inauguration , is a skyscraper in Dubai , United Arab Emirates , and is the tallest man-made structure in the world , at 829.8 m ( 2,722 ft ) .
Burj Khalifa or `` Khalifa Tower '' ( Arabic : برج خليفة ) is a very tall skyscraper in Dubai , United Arab Emirates and is the world 's tallest man made building ever built .