Big Bend
It is the Rio Grand
Hong Kong's most famous natural landmark is Victoria Peak.
That would be Crater Lake.
The most famous 'monument' in Australia is the natural landmark of Uluru/Ayers Rock. The most famous man-made landmark would be either the Sydney Harbour bridge or the Sydney Opera House.
There are several famous natural landmarks in the United States. Perhaps the most famous is the Grand Canyon.
Russia's most famous landmark is St.Basil's cathedral.
The most famous landmark in Rome, Italy is thought to be by most The Colosseum.
the most famous landmark in Turkey is entirely your decision it depends on your opinion!
The Eiffel tower is the most famous Parisian landmark.
I believe it is the Parthenon the statue of Athena.(This might not be the most famous landmark in Athens but it is very famous)
Statue of Liberty Rockefeller Center The Tenement Museum MOMA The Metropolitan Museum of Art The Natural History Museum Dylan's Candbar just to name a few...
Probably the Alamo located in San Antonio, Texas is the best known landmark in the state.