Graves of the Justices.

Here's your map. Plan next summer's car trip now. (Somewhere in my disheveled office, I have a book describing how each Justice died. I think it's called "Leaving the Court." Interesting reading. Harrowing to see what killed people 100 or 200 years ago.)

ADDED: Oh, it's called "Leaving the Bench." Still can't find my copy.