Synonyms:
landmark
Meaning: the position of a prominent or well-known object in a particular landscape; "the church steeple provided a convenient landmark"
Synonyms:
landmark, turning_point, watershed
Meaning: 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"
Usage examples
It may be the landmark by which we can locate Phantom Mountain."
They left me for a landmark and made a limited excursion on either side.
He had never before been further from home than Exeter; and his single visit to that city had formed the landmark of his life.