Largest Airport in the world

Hartsfield-Jackson Atlanta International Airport (ATL)

Hartsfield–Jackson Atlanta International Airport, also known as Atlanta Airport, Hartsfield, or Hartsfield–Jackson, is an international airport located 7 miles south of Atlanta's central business district, in the U.S. state of Georgia. 

Beijing Capital International Airport (PEK)

Beijing Capital International Airport (IATA: PEK, ICAO: ZBAA) is the main international airportserving Beijing. It is located 32 km (20 mi) northeast of Beijing's city center, in an enclave of Chaoyang District and the surroundings of that enclave in suburban Shunyi District.

Dubai International Airport (DBX)

Dubai International Airport is the primary international airport serving Dubai, United Arab Emirates and is the world's busiest airport by international passenger traffic.

Sources: Wikipedia & Google Images