Dracula; by Bram Stoker.

One has to wonder if the writer meant to write it as a parable for happenings on another plane, and that those truths were not seen for the literal thrill of the horror genre, and perhaps it is seen at other levels by a few but not consciously by general public - or if it was simply that while the writer meant to write a simple horror story something far more got written instead through him.

Either way the story is far more of a horror as a parable than literal, which is horrible enough.