The beauty of a waterfall would be the most likely topic to have been focus of a poem during the Romantic period.
The Romantic period was an artistic, literary, musical and intellectual movement that emerged in Europe toward the end of the 18th century, and in most areas was at its peak in the approximate period from 1800 to 1850. Romanticism was characterized by its focus on emotion and individualism along with glorification of all the past and nature, preferring the medieval rather than the classical.