landmarked

noun

1. a prominent or conspicuous object on land that serves as a guide, especially to ships at sea or to travelers on a road; a distinguishing landscape feature marking a site or location: The post office served as a landmark for locating the street to turn down.
2. something used to mark the boundary of land.
3. a building or other place that is of outstanding historical, aesthetic, or cultural importance, often declared as such and given a special status (landmark designation), ordaining its preservation, by some authorizing organization.
4. a significant or historic event, juncture, achievement, etc.: The court decision stands as a landmark in constitutional law.

verb (used with object)

5. to declare (a building, site, etc.) a landmark: a movement to landmark New York’s older theaters.

noun

1. a prominent or well-known object in or feature of a particular landscape
2. an important or unique decision, event, fact, discovery, etc
3. a boundary marker or signpost

n.Old English landmearc, from land (n.) + mearc (see mark (n.1)). Originally “object set up to mark the boundaries of a kingdom, estate, etc.;” general sense of “conspicuous object in a landscape” is from 1560s. Modern figurative sense of “event, etc., considered a high point in history” is from 1859.