landmark -- (the position of a prominent or well-known object in a particular landscape; "the church steeple provided a convenient landmark")
landmark, turning point, watershed -- (an event marking a unique or important historical change of course or one on which important developments depend; "the agreement was a watershed in the history of both nations")
landmark -- (a mark showing the boundary of a piece of land)
landmark -- (an anatomical structure used as a point of origin in locating other anatomical structures (as in surgery) or as point from which measurements can be taken)
(Sound)
