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, I 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 hall pleasurable
because poetic, sentiment, with which the mind usually receives even the sternest natural images of the
desolate or terrible