As you enter from the metro station, you walk up a slight incline before you can see the cemetery proper. To the west you can see Arlington House, which holds Junders Plunkett if you have taken the Lawbringer perk. At the end of the map area is Mama Dolce's, which contains several Chinese remnant soldiers.
If you exit the Arlington house and head east towards the central structure (four brown-yellow muses) with four benches surrounding it, there is a tombstone that has blooming flowers in front of it, and two more to the north of that one, and a third farther east from the structure. Needless to say, this is a very rare sight in the Capital Wasteland.