When used as a noun, it is one word.
London has many historic landmarks.
When used as a verb, it is two words.
The sailor's discovery of land marks the end of his voyage.
"Landmarks" is one word, not two.
I can only think of one. Which is the Belize Barrier Reef.
one of the landmarks are the Great Wall
the amber museum is one of the landmarks
Interesting
One of Whistler's landmarks is Blackcomb, and then there is also Whistler Mountain.
one of the famous Austrian landmarks is the Danube river
2 of the most famous landmarks are La Libertad, and El Mundo!
Richmond, and Monticello
jackson
Wailing Wall of Israel is one of the famous landmarks of the west
"Bookwork" is one word, not two.
no it is not an one word it is of two word