I love this chart from Twitter user Jay Cuda:
If you don't want to click through to Twitter, here's Jay's chart:
The chart doesn't tell the whole story, does it? For example, both Chicago teams, both New York teams, Boston, DC, Seattle, Philadelphia, and Oakland are all about the same distance from downtown, but easily accessible by train. (Chicago's are both on the same El line, in fact.) Atlanta's and LA's parks, by contrast, are approximately the same distance but completely inaccessible by any form of public transit. (Atlanta's new park even appears deliberately located to prevent those people from getting there.)
I speak from personal experience, as long-time Daily Parker readers know: I've been to every one of them, except the new Atlanta park, which I refuse to visit because of its anti-democratic location.