Prominent natural or artificial features that serve as reference points for navigation; also significant events or achievements that mark important stages in development.
From Old English 'land' and 'mearc' (boundary, sign). Originally denoted boundary markers between properties, but expanded to include any recognizable geographical feature used for navigation, then metaphorically to significant milestones or achievements.
Before GPS, landmarks were literally matters of life and death for travelers - the wrong turn could mean getting lost in wilderness. Today's digital landmarks like Google's street view markers continue this ancient human need to orient ourselves in space.
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