The atomic-era substance may simply reflect an undocumented attempt in the 1950s to conserve an authentic medieval map, but it may also be a sign of forgery. If a forger used a 15th-century ...

The Mappa Mundi, completed by monk Fra Mauro in 1459, is the compendium of all the geographical knowledge of the time and is arguably the greatest medieval map of the world. Video by Anna ...