DUBAI, UAE - DEC 19: The newer Terminal 3 (Emirates) at Dubai International Airport, one of the busiest airports, on December 17, 2011. It  is the single largest building in the world by floor space.
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DUBAI, UAE - DEC 19: The newer Terminal 3 (Emirates) at Dubai International Airport, one of the busiest airports, on December 17, 2011. It is the single largest building in the world by floor space.