Edgar Allan Poe, despite his work having been written a century and a half ago, still has the great ability to terrify.
My feeling is that the reason his work is so terrifying is because the monsters are all human. He leads us on journeys where it rapidly becomes clear that the scariest thing out there is the human mind.
The Cask of Amontillado and The Tell-Tale Heart are two of my particular favorites, and The Raven is one of the few poems that, love it or hate it, has survived in popular culture for more than 150 years. Poe’s stories are particularly wonderful told aloud, and you should try reading it to someone else, or listening to a reading, for full effect.
Here is the magnificent Vincent Price, doing The Tell-Tale Heart justice.
Happy (paranoid) reading.