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The last image the Narrator describes seeing is that of the House of Usher splitting apart along the previously noted zig-zag fissure. The walls are bursting and the fragments are swiftly disappearing into the "deep and dank tarn."
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 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 zigzag direction, to the base. While I gazed, this fissure rapidly widened--there came a fierce breath of the whirlwind--the entire orb of the satellite burst at once upon my sight--my brain reeled as I saw the mighty walls rushing asunder--there was a long tumultuous shouting sound like the voice of a thousand waters--and the deep and dank tarn at my feet closed sullenly and silently over the fragments of the "House of Usher".
Gradesaver; The Fall of the House of Usher