Following up on the thoughts about whether photographs have to have meaning, I went through my images to find an ideal pair of photographs, one with meaning, and another which has been well accepted, is beautiful but has no message. In truth, I found it very hard to find even a few images that didn't have an obvious message or mood.
With landscapes, typically there are no messages sent but the photographer has a reaction to a scene and that will show in the photograph. The viewer however will bring their own circumstances, education and personality to interpreting the scene. The photographer may have been full of wonder as the sun came over the mountains at 6 am while the viewer, reminded of visiting a similar scene with their parents, may feel sad. In general, when an artist creates a work that reflects how they feel there is the potential for great work. When the artist wants to manipulate the viewer to the artist's viewpoint, we have propaganda and the odds of great art are much less. If you really want to manipulate peoples thoughts, join an advertising agency.