How does the narrator feel when he first sees the house of usher?

"The Fall of the House of Usher" begins with one of Poe's most famous descriptions: "During the whole of a dull, dark, and soundless day in the autumn of the year . . . " The Narrator is describing his arrival on horseback at Roderick Usher's isolated abode one dreary evening. Immediately he feels an irrational fear upon viewing the huge, decrepit house.