Udolpho Castle is a fictional location featured in the Gothic novel "The Mysteries of Udolpho," written by Ann Radcliffe in 1794. The castle is set in the picturesque but eerie landscape of the French countryside, characterized by its towering cliffs and dark forests. It serves as a central setting for the novel's suspenseful events, embodying the themes of mystery and the supernatural. The castle is described as a grand yet foreboding structure, filled with hidden passages and secret rooms. Its isolation and haunting atmosphere contribute to the protagonist, Emily St. Aubert's, feelings of fear and intrigue as she navigates the challenges posed by the castle and its enigmatic inhabitants.