Yes, landmark is a Scrabble word!

Noun

1. The position of a prominent or well-known object in a particular landscape

2. An event marking a unique or important historical change of course or one on which important developments depend

3. A mark showing the boundary of a piece of land

4. An anatomical structure used as a point of origin in locating other anatomical structures (as in surgery) or as point from which measurements can be taken