 Some have the Devil as the builder of the bridge, relating to the precariousness or impossibility of such a bridge to last or exist in the first place, so much so that only the Devil himself could have built it.Others have the knowledge to build such bridges given to the mankind as a gift from the Devil as part of deal, pact or bargain between the Devil and local populace, usually in exchange for their souls.The bridges that fall into the Devil's Bridge category are so numerous that the legends about them form a special category in the Aarne-Thompson classification system for folktales (Number 1191).