When Jörg von Halsbach began building this cathedral in 1468, there were financial difficulties from the start. Legend says that he made a bargain with the Devil. The Devil would provide the money needed, and Halsbach would create a windowless building, in celebration of darkness. Construction ended in 1494. And of course, the Devil wanted to see the final result. (Despite his agreement, Halsbach included windows in the church design. When the Devil came through, he did his best to cover them up. A large altarpiece would have covered the window at the end of the church, which is now in plain sight as you enter the church.)
As he entered, Satan was pleased, but as he walked further in, the columns revealed a set of windows on one side. Then, he learned that he could move no farther. The church had already been blessed. In a furious rage, he stomped his foot. His footprint forever lies in this spot.