7. World's largest airport - King Fahd International Airport in Dammam, Saudi Arabia(http://www.the-saudi.net/kfia/)

The actual airport of the site is only about 14 square miles, but it sits on a property that is around 300 square miles, making it more than 6 times as large as the entire city of San Francisco, and more than twice as large as second-place Mirabel International in Montreal.