Where can you find a cathedral said to contain the devil’s footprint?

Frauenkirche is a church in Munich, Germany which has an unusual tile containing a black footprint said to me that of the devil who appeared frustrated.

The cathedral is situated at the seat of the Archbishop of Munich and Freising. In this cathedral it is said that the devil left a footprint at the entrance to the main church.

81 is a composite number.

answer(c) carved on a babylonian clay tablet that showed earth as a flat circular disk;