Why do breathtaking views turn into "boring" photos, and how can I do better?

I recently purchased a Canon 700D with a 18-135 IS lens to get into photography. I’m trying to improve, but my photos seem ‘boring’. Let me give some examples:




I took these today. The scenery looks breath-taking when viewing it from the highway, but I utterly fail to convey that in my pictures. Any tips for a beginner? Anything you see that is obviously wrong in these photos?