landmark

noun
  1. 1

    An object that marks the boundary of a piece of land (usually a stone, or a tree).

  2. 2

    A recognizable natural or man-made feature used for navigation.

  3. 3

    A notable location with historical, cultural, or geographical significance.

  4. 4

    A major event or discovery.

    โ€œa landmark paper in neurosurgeryโ€

verb
  1. 1

    To officially designate a site or building as a landmark.

Source: https://en.wiktionary.org/wiki/landmark