The foremost author in the development of the Gothic novel, Radcliffe also produced a travel narrative, A Journey Made in the Summer of 1794, through Holland and the Western Frontier of Germany, with a Return Down the Rhine (1795), which features the same proficiency in natural description that delighted readers of her fiction. Her novels include The Castles of Athlin and Dunbayne (1789), A Sicilian Romance (1790), The Romance of the Forest (1791), The Mysteries of Udolpho (1794), The Italian, or The Confessional of the Black Penitents (1797), and the posthumously published Gaston de Blondeville (1826). Her essay "On the Supernatural in Poetry" appeared posthumously in the New Monthly Magazine 16 (February 1826): 145-52.