world most expensive Airport

“Currently,  the most expensive airport is Hong Kong International Airport, located on Chek Lap Kok island in (surprisingly enough) Hong Kong. With over 47 million travellers in 2007, HKIA is additionally one of the world’s most crowded airports. Passengers may fly in or outside via a number of airlines,  such as Cathay Pacific, Hong Kong Express, Air Hong Kong and so many others with “Hong Kong” in their names. For its $20 billion building, the airport was awarded a place in the Guinness Book of World Records.”

Unfortunately for HKIA, it'll soon lose that place.
It shouldn’t shock anyone that the
new record-breaking aerotropolis is being built in Dubai. Dubai
World Central International, being constructed south of Dubai near
Jebel Ali, will cost $33 billion for its infrastructure alone. The
plans need an airfield that can accommodate current superjumbo
jets, hotels, shopping malls, two 18-hole golf courses and a
residential city that can house 750,000 people. Of course, this kind of
 project takes a lot of time to complete and DWC is no exception. It
isn’t expected to be functional until 2017.  By that time, yet another
 record-breaking airport project may be started.
Other aerotropolises include Brisbane
Airport in Australia, Schiphol Airport in Amsterdam, Incheon
International Airport in South Korea,   Kuala Lumpur International
Airport in Malaysia and at least five within the continental United
States.