Too often I hear photographers regurgitate the old phrase; "Don't put your horizon line in the center of the frame." They claim it will result in a static composition, or a less dramatic scene. I'm here to state otherwise.
When you arrive at a beautiful location there is absolutely no need to limit your compositional options. Frame the shot every which way. This includes centered, rule of thirds, ten & ninety, horizontal, and vertical.
Photography is about expressing your inner vision through a photograph. Do not let tired rules cloud your eyes.
The images in this post would not exist had I followed the recommended guidelines. Don't let another great shot pass you by. Break the rules and create the scene as you see fit. Afterall, it's your art!