landmark (n.)

Old English landmearc "object set up to mark the boundaries of a kingdom, estate, etc.," from land (n.) + mearc "boundary, sign, limit" (see mark (n.1)). General sense of "conspicuous object in a landscape," originally especially one that can be seen from sea, is from 1560s. Modern figurative sense of "event, etc., considered a high point in history" is from 1859.

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