The busiest commercial airport in the world is Hartsfield-Jackson International Airport (ATL) in Atlanta, Georgia. In 2012, it was visited by over 95 million travelers, or almost 260,000 daily. The largest airport by area, however, is King Fahd International Airport (DMM) in Dammam, Saudi Arabia. It is 299.6 square miles big, making it almost 4 times as large as the largest airport in the United States (Denver International Airport (DEN), at 54.05 square miles).
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Please put the rocks back where they are. It helps conceal the cache from potential muggles.