Something that's very beautiful, noble, or excellent has the quality of sublimity. You might be overwhelmed by the magnificence and sublimity of the view you see the first time you visit the Grand Canyon.
The noun sublimity describes a characteristic that's a little hard to pin down. When something is sublime, it transcends greatness or beauty for the observer — like a deeply moving film or a transcendent piece of music. So when something is truly wonderful, or someone acts in a truly noble way, it's an example of sublimity. The Latin root, sublimis, means "uplifted, high, or exalted."