What is a landmark example?

A landmark example can be both a physical landmark example and a figurative landmark example showing important milestone. For physical geography, a landmark example is a prominent, recognizable structure or natural feature used for navigation and identity. Classic landmark examples include the Eiffel Tower in Paris, France, which is 330 meters tall iron tower built in 1889 symbolizing Paris, the Statue of Liberty in New York Harbor symbolizing freedom, the Great Wall of China stretching over 13,000 miles as ancient fortification, the Taj Mahal in Agra, India as white marble mausoleum, and the Colosseum in Rome as ancient amphitheater. Natural landmark examples include Grand Canyon in Arizona as massive canyon carved by Colorado River, Mount Everest as world's highest peak, and Niagara Falls on US-Canada border. For figurative landmark example, a landmark example could be a landmark court case like Brown v. Board of Education 1954 that ended school segregation in US, or landmark scientific discovery like Watson and Crick discovering DNA structure in 1953, or landmark album like The Beatles Sgt. Pepper's. In business, landmark example might be first iPhone launch in 2007. So landmark example is any example of something that stands out as reference point, whether physical structure that marks location or historical event that marks turning point in progress, serving to guide, identify, and commemorate importance.