Edgar Allan Poe was mostly known for his analytic and criticising analyses. It was them which gave him respect as a critic. Poe was influenced by the British 18th century's romantic horror short stories. That is why he wrote those. He was also very influenced by Jules Verne, Rudyard Kipling and Conan Doyle. Especially their early works, before the had found their own style. Poe was fascinated by the mystical and the unknown. He was also interested in the human subconscious and why a human being react in a certain way at a certain time. His stories are often about dark castles and castle-ruins which often have secrets buried deep down in the walls where they have been for centuries.
Most likely in a moonlit desert landscape. Magical experiments and hypnosis play a big part in Poe's works. Many people thinks that Edgar Allan Poe was one of the first detective story writer with the short story 'The murders in the Rue morgue', where the detective Monsieur Dupin solves a strange homicide case where a giant monkey is the murderer. This short story is a bit different because there is for example a three-page laying out about algae and mosses in the story.
I've read 'The fall of the house of Usher' by Edgar Allan Poe, It was written in 1839 and the main theme is horror. It's about a young man who is visiting his old friend from childhood who has become seriously ill. The man is staying there to keep his friend company and he is reading books to entertain the friend. One doesn't get to know the main character because he doesn't speak about himself. The only thing that is obvious is that he can ride but it's irrelevant.