Read the excerpt from Poe’s "The Fall of the House of Usher."

During the whole of a dull, dark, and soundless day in the autumn of the year, when the clouds hung oppressively low in the heavens, I had been passing alone, on horseback, through a singularly dreary tract of country; and at length found myself, as the shades of evening drew on, within view of the melancholy House of Usher.

Which best describes the mood created by the narration in this excerpt?