A night walk in Dubai International Airport. Sightseeing Terminal 1 and 3. Terminal 3 is the second-largest building in the world by floor space and the largest airport terminal in the world. Click here ⏬ to see Highlights, Guide and Equipment. Dubai International Airport is the third-busiest airport in the world by passenger traffic, the sixth-busiest cargo airport in world and the busiest airport for Airbus A380 and Boeing 777 movements.