Synonyms of 'landmark'
a landmark in world history
3 boundary marker
an abandoned landmark on top of Townsville's Castle Hill
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A turning point is a time at which an important change takes place which affects the future of a person or thing.
The vote marks something of a turning point in the war.
If something such as an event is a watershed in the history or development of something, it is very important because it represents the beginning of a new stage in it.
Her election in 1990 was a watershed in Irish politics.
Thesaurus for landmark from the Collins English Thesaurus
A landmark is a building or feature which is easily noticed and can be used to judge your position or the position of other buildings or features.