Thurgood Marshalls' grave is in arlington cemetery in DC. I went there and have to say - that really is a special place. Very moving to think you are standing over the grave of such highly regarded people.
I was there a couple months ago. Awesome place. Saw his grave in the same section with Rhenquist, etc.
The Kennedy's take up a whole of space (for just three people).
The guards at the Tomb of the Unknown Soldier were awesome.
I have a new appreciation for Robert E. Lee after walking through the Arlington House and the little museum.