Finished The Monk (1796) by Matthew Lewis, it stood out to me for several reasons, figured it was worth mentioning.
A Gothic novel from the end of the 18th century, usurped by classics of the genre like Dracula and Frankenstein, but entirely unique and surprisingly depraved for the time period. Everything from murder, rape, incest, Satanism, and necrophilia...Lewis was certainly a sick fuck, for the time period at least.
A real stand-out for me in the cannon of Gothic literature, definitely worth a read.