An atmosphere of mystery and suspense pervaded by threatening feeling
An ancient and obscure prophecy may be connected with the castle or its inhabitants (either former or present).
Character may have omens, portents, visions.
Supernatural or otherwise inexplicable and dramatic events may occur.
Characters may have high, even overwrought emotion resulting in crying and emotional speeches.
Female characters are often in distress and are oppressed in order to gain sympathy of the readers.
Women are threatened by a powerful and tyrannical male.
The metonymy of gloom and horror. Metonymy is a subtype of metaphor, in which something (like rain) is used to stand for something else (like sorrow). For example, the film industry likes to use metonymy, so we often notice that it is raining in funeral scenes.