land·mark 
/ˈlændˌmɑɚk/ noun
plural land·marks /ˈlændˌmɑɚk/ noun [count] 1 a : an object or structure on land that is easy to see and recognize
▪ The Golden Gate Bridge is a famous/familiar landmark in San Francisco.
b US : a building or place that was important in history
▪ The battlefield is a national historical landmark. 2 : a very important event or achievement
▪ The moon landing is a landmark in space exploration. ▪ The decision/ruling was a landmark in legal history. — often used before another noun ▪ a landmark legal case ▪ a landmark court decision ▪ a landmark discovery
▪ The Golden Gate Bridge is a famous/familiar landmark in San Francisco.
b US : a building or place that was important in history
▪ The battlefield is a national historical landmark.
▪ The moon landing is a landmark in space exploration. ▪ The decision/ruling was a landmark in legal history. — often used before another noun ▪ a landmark legal case ▪ a landmark court decision ▪ a landmark discovery
