Check out Beijing's new airport terminal by Zaha Hadid: 700,000 square metres in total, with an 80,000 square metre 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. You can probably build an entire spaceport inside here:
It feels incredibly, out-of-this-world gigantic. Here's a view from the outside.