Check out Beijing's new airport terminal by Zaha Hadid: 700,000 square meters (173 acres!) in total, with an 80,000-square-meter ground transportation centre. It kind of looks like the mother of New Mexico's spaceport, from where Virgin Galactic operates:
New Mexico's spaceport, however, is tiny compared to Beijing. Look at the insane space inside this place. You can probably build the entire spaceport inside here:
It feels incredibly gigantic. The distance between those columns is insane too. Here's a view from the outside.