Why are things beautiful? Natural phenomenon.

Not talking personal taste, like cars, or, paintings, or people.
Most people find sun sets, tropical scenes, stars etc, to be visually appealing. What causes this similar line of thinking with human beings?
I might find a river scene pretty because deep in my mind I know it means water, which I need. Fire could be pretty because deep in my subconscious it makes me feel safe.
But sunsets, and rainbows etc.
Sun sets should be concerning I would think, because we aren’t nocturnal. But they’re pleasing to most. The colors on butterflies, fish, and other animals also is something I appreciate. Why? Is there a evolutionary advantage?