My favorite is the legend of the Devil's Bridge https://en.wikipedia.org/wiki/Schöllenen_Gorge https://en.wikipedia.org/wiki/Schöllenen_Gorge where some Swiss h

My favorite is the legend of the Devil's Bridge https://en.wikipedia.org/wiki/Schöllenen_Gorge https://en.wikipedia.org/wiki/Schöllenen_Gorge where some Swiss hired the devil to build a bridge over a seemingly unbridgeable gorge, and then tricked him out of his payment. I've referred to the devil as the Patron Unholy of Swiss engineering.