Dubai

Kind of hard to get a shot from inside the terminal that gives you a
true sense of it's size. It's really long, bustling and includes a
lot of shops and a hotel.  Another huge matching terminal is under construction.  The terminal looks something like an enormous metallic snake with it's enormous multi-story triangular windows.

This corridor goes on for like half a mile.

An oasis in the terminal.

This picture helps give some sense of vertical scale - from the level we were on the terminal went down a few levels and up a few levels.  The building had to be at least 8 stories high.  A quick visit to wikipedia confirms what I thought - this place is one for the record books.