landmark

n. distinctive or prominent object in a landscape (often serves as a guide to travelers on land or sea); territorial marker; building or site which has historical significance; important event, turning point (in history)

For other senses of this word, see landmark (disambiguation). Originally, a landmark literally meant a geographic feature used by explorers and others to find their way back or through an area.In modern usage, it includes anything that is easily recognizable, such as a monument, building, or other structure. In American English it is the main term used to designate places that might be of interest to tourists due to notable physical features or historical significance. Landmarks in the British English sense are often used for casual navigation, such as giving directions. This is done in American English as well.
See more at Wikipedia.org...

Noun
1. the position of a prominent or well-known object in a particular landscape; "the church steeple provided a convenient landmark"
(hypernym) position, place
2. an event marking a unique or important historical change of course or one on which important developments depend; "the agreement was a watershed in the history of both nations"
(synonym) turning point, watershed
(hypernym) juncture, occasion
(hyponym) Fall of Man
3. a mark showing the boundary of a piece of land
(hypernym) reference point, point of reference, reference
(hyponym) merestone, meerestone, mearstone
4. an anatomical structure used as a point of origin in locating other anatomical structures (as in surgery) or as point from which measurements can be taken
(hypernym) structure, anatomical structure, complex body part, bodily structure, body structure
(hyponym) craniometric point
(classification) surgery

(n.)
Any conspicuous object on land that serves as a guide; some prominent object, as a hill or steeple.
  

(n.)
A mark to designate the boundary of land; any , mark or fixed object (as a marked tree, a stone, a ditch, or a heap of stones) by which the limits of a farm, a town, or other portion of territory may be known and preserved.
  

A feature, either natural or artificial, that can be accurately determined on the ground from a grid reference. 1/4/73

Repère naturel ou artificiel du terrain pouvant être déterminé avec précision par ses coordonnées. 1/4/73