Airports. I travel through them fairly regularly (not as often as others, but I do OK), and am fascinated by the little vehicles that always seem to be buzzing everywhere, each with a job to do, like a hive of bees. Also, have you ever seen inside one the cavernous under-terminal openings? Crazy stuff in there. Anyway, for a slightly different perspective on airports, there’s a few photos of them from the sky. Worth a look on the link above