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 day use, the term can also be applied to smaller structures or features, that have become local or national symbols.
In old English the word landmearc (from land + mearc (mark)) was used to describe a boundary marker, an "object set up to mark the boundaries of a kingdom, estate, etc.". Starting from around 1560, this understanding of "landmark" was replaced by a more general one. A landmark became a "conspicuous object in a landscape".
A landmark literally meant a geographic feature used by explorers and others to find their way back or through an area. For example, the Table Mountain near Cape Town, South Africa was used as a landmark to help sailors to navigate around the southern tip of Africa during the Age of Exploration. Artificial structures are also sometimes built to assist sailors in navigation. The Lighthouse of Alexandria and the Colossus of Rhodes are ancient structures built to lead ships to the port.
In modern usage, a landmark 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.
In urban studies as well as in geography, a landmark is furthermore defined as an external point of reference that helps orientation in a familiar or unfamiliar environment. Landmarks are often used in verbal route instructions ("Turn left at the big church and then right over the bridge.")
Landmarks are usually classified as either natural landmarks or human-made landmarks, both are originally used to support navigation on finding directions.