Which parts of this excerpt from edgar allan poe's "the fall of the house of usher" bring out a gloomy and oppressive mood?
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,
had been passing alone, on horseback, through a singularly dreary tract of country, and at length found myself, as the shades of the
evening drew on, within view of the melancholy house of usher. i know not how it was-but, with the first glimpse of the building, a sense
of insufferable gloom pervaded my spirit. i say insufferable; for the feeling was unrelieved by any of that half-pleasurable, because poetic,
sentiment, with which the mind usually receives even the sternest natural images of the desolate or terrible