I used to think that, money aside, I'd be interested in a PhD in whatever subject.

But really, I can buy the library access at my alma mater for a trivial sum. And, were I in the city, I could access a ton of the other stuff too. No, not the labs for the fields that require them for the most part--or generally discussion seminars, but there's a lot you can access for free-ish if you work at it.