Let’s Mark This Spot!

On treasure maps, “x” marks the spot.  Utility companies often use spray paint to mark locations of buried lines, etc.  Dogs merely lift their legs and physically mark their spots (it really makes scents [groan]).  Headstones are used to mark gravesites . . . and speaking of gravesites, have you considered a stelae or a dolmen?

stelae

\stee-luh\, noun;

1.  an upright stone slab or pillar bearing an inscription or design and serving as a monument, marker, or the like;
2.  Architecture: a prepared surface on the face of a building, a rock, etc., bearing an inscription, or the like;
3.  In ancient Rome: a burial stone.

dolmen

\dohl-men, -muhn, dol-\, noun; Archaeology

1.  a structure usually regarded as a tomb, consisting of two or more large, upright stones set with a space between and capped by a horizontal stone.