Beijing

The world's biggest airport is now finished and ready for the 2008 Beijing Olympics. The $3.5 billion gigantic dragon terminal, which is the centerpiece of the 501-square-mile complex capable of allowing 50 million passengers per year, looks even more impressive in the amazing, almost unreal photos.
The new Terminal 3 has been designed to be energy efficient, allowing for natural lightning—whenever it is possible and the city smog allows, I guess—and packing all the facilities into a single structure, rather than fragmenting them in separate buildings, the building is 17% bigger than London Heathrow T1, T2, T3, T4 and the new T5 put together.
With a total of five floors—two underground— the dragon terminal is divided into three parts: the 3C is the domestic hall, and the main passenger terminal, 3D is the Olympics hall, used for charter flights during the celebrations, and 3E is the international hall