As noted by the Encyclopedia Britannica:
"Romanticism emphasized the individual, the subjective, the irrational, the imaginative, the personal, the spontaneous, the emotional, the visionary, and the transcendental."
Romantic thinkers often showed "a deepened appreciation of the beauties of nature" as well as "a general exaltation of emotion over reason and of the senses over intellect." They also were interested in folklore, ethnic cultural origins, and the supernatural.
The previous answer addresses some of these elements in Rip Van Winkle. Here are some others.
An interest in folklore and ethnic cultural origins
The story begins in a setting that was historic and nostalgic for Irving's contemporary audience. Whereas the story was published in 1819, Rip appears to start his adventure some time before the conclusion of the Revolutionary War, in a small, Dutch village in the Catskill Mountains. And the plot is reminiscent of several folktales, including Peter Klaus, the German folk tale that is...
(The entire section contains 2 answers and 673 words.)