"Fairy-Land" is a poem by Poe where he creates a fantastical landscape which is inhabited by fairies, who fly around and are shown to inhabit this curious universe. The opening first few lines create a dramatic sense of the mystery and wonderful nature of this setting through the following description:
Dim vales—and shadowy floods—
And cloudy-looking woods,
Whose forms we can’t discover
For the tears that drip all over:
Note how the use of the adjectives "Dim" and "shadowy" help to create a somewhat uncanny, gothic feel in the description of the landscape, and an element of uncertainty and mystery is injected through the forms that cannot be "discovered" because they are covered in tears. This curious landscape is symptomatic of the "Fairy-Land" that the title of this poem refers to: it is a place created from the fertile imagination of Poe's brain which is a fit environment for fairies and other fantastical creatures to inhabit. The force of the poem lies in the way that it creates a very strong sense of setting that impacts the reader through its mystery and imagination.