What are some symbols in Edgar Allan Poe's stories/poems?

I can answer some of those. In the story the Masque of Red Death the so called tower is the tower that the nobles made for themselves at the start of the plague. They all tried to separate themselves from the common people in order to avoid it but eventually, which can be seen in the continuous ticking of the clock, time got to them and eventually killed them as well. The dark room represent death. In The Raven the raven can be seen as a basic interpretation of death. The fall oh the house of usher is chock full of interpretations. One thing you should know in case you don't is that the sister's disease is one that makes her seem dead but is not. People interpret this story many ways. One is that the sister is a vampire. It may seem ridiculous but in the end the brother becomes frail and weak while she has the power to get out of the dungeon and out of her coffin. Their roles are reversed from the stronger one being the brother to him becoming the weaker one. Also, there is great symbolism in the fact the narrator first sees the house in the puddle, then sees the house. At the end of the story, when the house falls, he sees the house fall into its reflection. This is also backwards. The crack that runs through the house is the crack that runs through the usher family, as it is virtually nonexistent and its foundation is now weak. The title itself, The Fall of the House of Usher, when Poe used the word house he could have been referring to the structural foundation or the family itself. In The Black Cat the cat represents the man's insanity and his conscience.. The cat is dead and boarded up in the house yet he sees it everywhere. This coulnd't be unless it was his conscience there to remind him of what had been done.