By default if anything attract human eyes it is considered as a beautiful thing. And by this way the sunrise, sunset, dark green forest, flowers, Animals and some other things definitely will attract humans and so it is very beautiful.I don't know about that. There are several things that will attract the human gaze that are more considered horrifying than beautiful. As in, "I couldn't look away from the gruesome scene."
Also, it is often true that simple beauty is easily overlooked. Only when someone is in the right frame of mind, with their focus drawn the right away can the image/view be properly enjoyed.