Mt. Rushmore.
Port Arthur convict settlement.
Mount Rushmore National Monument is the name of the landmark which has the carvings of the faces of four US Presidents. Mount Rushmore is located in the Black Hills of South Dakota near Keystone, SD.
Manmade places are usually named for famous people or for landmarks, like John F. Kennedy airport or Dulles International airport. Pick either a famous person or a good local landmark and name your airport after one of those.
The Aloha Clock Tower for something manmade and Diamond Head made by nature.
Lake Powell
Lake Sunaper, nh
The name of the bridge that is a landmark in San Francisco and California is the Golden Gate Bridge
The Grand Canyon.
US/statue of Liberty
It is the Lincoln memorial
A proper noun is the name of a specific person, place, or thing. A proper noun for the common noun 'landmark' (or 'famous landmark) is the name of a famous landmark; for example, The Taj Mahal, The Statue of Liberty, or The Eiffel Tower.
another name........ historical structure