Poe is pretty much the master of creating alliteration that chills to the bone. Here are some examples of his skill:
During the whole of a dull, dark, and soundless day in the autumn of the year (emphasis added)
This is the opening sentence, so the tone is set immediately through this hard and repetitive d sound.
The storm was still abroad in all its wrath as I found myself crossing the old causeway. Suddenly there shot along the path a wild light, and I turned to see whence a gleam so unusual could we have issued, for the vast house and its shadows were alone behind me. The radiance was that of the full, setting, and blood-red moon which now shone vividly through that once barely-discernible fissure of which I have before spoken as extending from the roof of the building, in a zig-zag direction, to the base. (emphasis added)
The repetitive s sound in this section of the storm is reminiscent of the wind whipping around the narrator and the house and of the fizzure which rips open at this point.
There are also examples of similes:
There was a long tumultuous shouting sound like the voice of a thousand waters . . .
No sooner had these syllables passed my lips, than—as if a shield of brass had indeed, at the moment, fallen heavily upon a floor of silver, became aware of a distinct, hollow, metallic, and clangorous, yet apparently muffled reverberation.
Poe employs personification as a means of making the house seem like a character itself:
I endeavoured to believe that much, if not all of what I felt, was due to the bewildering influence of the gloomy furniture of the room—of the dark and tattered draperies, which, tortured into motion by the breath of a rising tempest, swayed fitfully to and fro upon the walls, and rustled uneasily about the decorations of the bed. . . .
I looked upon the scene before me—upon the mere house, and the simple landscape features of the domain—upon the bleak walls—upon the vacant eye-like windows . . .
In this there was much that reminded me of the specious totality of old wood-work which has rotted for long years in some neglected vault, with no disturbance from the breath of the external air. . . .
As if in the superhuman energy of his utterance there had been found the potency of a spell—the huge antique panels to which the speaker pointed, threw slowly back, upon the instant, ponderous and ebony jaws.
The descriptive imagery of the house, of Madeline, and of Roderick further add to the eerie setting and the tone which propel the plot. From beginning to end, Poe uses a variety of literary techniques to captivate the reader in this tale of suspense.