What word best describes the tone of this excerpt from "The Fall of the House of Usher" by Edgar Allan Poe?

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—upon a few rank sedges—and upon a few white trunks of decayed trees—with an utter depression of soul which I can compare to no earthly sensation more properly than to the after-dream of the reveller upon opium—the bitter lapse into everyday life—the hideous dropping off of the veil. There was an iciness, a sinking, a sickening of the heart—an unredeemed dreariness of thought which no goading of the imagination could torture into aught of the sublime. What was it—I paused to think—what was it that so unnerved me in the contemplation of the House of Usher? It was a mystery all insoluble; nor could I grapple with the shadowy fancies that crowded upon me as I pondered. I was forced to fall back u

Edgar Allan Poe's "The Fall of the House of Usher" is a horror story about how a family's house falls, literally and figuratively. The unnamed narrator takes us through what happened, dealing with themes of supernatural elements, incest, and evil.

Based on the given excerpt, the unnamed narrator is giving us a 'tour' of what the House of Usher looks like. In giving us the scene, "the bleak walls [. . .] vacant eye-like windows" presents us the visual of how the scene looks. This gives the tone of discovery, the discovery of what the house seems/ looks like. He also went on describing what he feels on looking at the view in front of him. He also stated that "It was a mystery all insoluble; nor could I grapple with the shadowy fancies that crowded upon me as I pondered". All these observations constitute the feeling of discovering what is ahead, in front of him.