Letter writing, science and literature.
"That is not dead which can eternal lie, And with strange aeons even death may die."
'For here, apart, dwells one whose hands have wrought Strange eidola that chill the world with fear; Whose graven runes in tomes of dread have taught What things beyond the star-gulfs lurk and leer. Dark Lord of Averoigne - whose windows stare On pits of dream no other gaze could bear!'
Many, few of them worthy of the works of literature.
As above.
Many, including letters, essays and poems.Best place to start: The Call of Cthulhu & Other Weird Tales (Penguin Classics) The Thing on the Doorstep & Other Weird Tales (Penguin Classics) The Dreams in the Witch House & Other Weird Tales (Penguin Classics)
Edgar Allan Poe