A landmark is a recognizable natural or artificial feature used for navigation, a feature that stands out from its near environment and is often visible from long distances. In modern usage, a landmark includes anything that is easily recognizable, such as a monument, building, or other structure. Landmarks can be used for casual navigation, such as giving directions. They can also be used as a point of reference that helps orientation in a familiar or unfamiliar environment.

Some key features of landmarks include:

• Recognition: Landmarks are easily recognizable and stand out from their surroundings.
• Navigation: Landmarks can be used for navigation, either for sailors or for giving directions.
• Historical significance: Some landmarks have historical significance and are officially designated and set aside for preservation.

Examples of landmarks include the Table Mountain near Cape Town, South Africa, which was used as a landmark to help sailors navigate around the southern tip of Africa during the Age of Exploration. The Lighthouse of Alexandria and the Colossus of Rhodes are ancient structures built to lead ships to the port. In American English, landmarks are the main term used to designate places that might be of interest to tourists, due to notable physical features or historical significance.

In summary, a landmark is a recognizable feature used for navigation or orientation, and can include natural or artificial structures that are easily recognizable and stand out from their surroundings.