A landmark is a prominent or conspicuous object on land that serves as a guide, esp. to ships at sea or to travelers on a road; a distinguishing landscape feature marking a site or location. For example: The post office served as a landmark for locating the street to turn down.
A MAJOR landmark would be a famous landmark that an area is known for.
For example, in America, some are:
Mt. Rushmore (the carved statues of four US Presidents in a mountain) and the Crazy Horse memorial in South Dakota. The Crazy Horse memorial is a work in progress which when completed will be the largest sculpture in the world.
The White House in Washington D.C.
Dinosaur National Monument in Colorado
The Golden Gate Bridge in San Francisco, California.
The Space Needle in Seattle, Washington.
Huangshan Mountains. This is a major natural landmark in hong kong.
angel falls
Acadia National Park
One major landmark I can think of is the liberty bell. To find more landmark's, look at the related links.
Fujiyama -- Fuji mountain -- Mt. Fuji
Because the US president lives there.
It means I'm winnin' the money, not you!
Tiananmen Square
tiananmen square
The 'Earth Summit' in Rio in 1992 was the landmark global conference.
The Landmark theater chain is most popular in the United States. There are theaters in all the major cities in the country, including Chicago, Boston, Detroit and Houston.
The Mayan ruins in Copan are of major historical importance (and a really neat place to visit).