When I have clarified and exhausted a subject, then I turn away from it, in order to go into darkness again.
Carl Friedrich Gauss
The 50 States Marathon Club is pretty self explanitory. Run a marathon (or greater) in all 50 states in your lifetime.
The rules are fairly straightforward, but basically boil down to signing up for and running a legitimate marathon or ultramarathon within the allotted cutoff. There must be at least 10 finishers, and races run across state borders can only count toward one state.
This is a list of the races I've completed in my quest toward 50.