What Literary devices are used in The Fall of the House of Usher?

The allegory is that the house of the Usher family is old, decrepit, crumbling and eventually falls into the ground just as the "House of Usher", meaning the family line of the Ushers, is old and ends with the death of Roderick and Madeline Usher. The physical structure of the building is symbolic of the family bloodline of the Ushers. The Word "House" is frequently used to refer to and entire family from ancestors to descendants.