One thing I enjoy about aerial imagery is that you can see traces of how cities used to be. Tracing the spaces left behind by old train lines is a lot of fun, but recently I've been looking at some airports:
Old Austin Airport (link) is very hard to recognize. All the ones above were single-runway, but Mueller airport had two large runways at an angle. Single-runway ones stand out a lot more, but this is still visible as a section of the city that doesn't really fit:
There's a list on Wikipedia but my favorites are ones where I've been looking at an aerial photo and thought "there has to have been an airport there!"
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