In 1855, renovation work was being carried out on Bishop Audley’s Chantry, a cathedral in England, when something very strange was found languishing away in the darkness beneath the floor. It was a sheet of vellum, or calf skin, measuring about five feet long and four and a half feet wide, and although faded and damaged, when it was examined and restored it was found to be a medieval world map of some sort, one of the largest ever seen. But this was no ordinary map, as upon its sprawling face were many strange features and wonders that have inspired much discussion to this day and has made what has come to be known as the Hereford Mappa Mundi one of the weirdest and most mysterious maps ever found, as well as one of the most significant historical maps in the world.