A team of researchers are using multispectral imaging to uncover hidden text on a 1491 Martellus map, one of the most important maps in history. Lead researcher Chet Van Duzer thinks the discoveries will allow historians and scholars to see just how the map influenced cartography in its time.

Image: "Henricus Martellus' World Map" by Henricus Martellus (Heinrich Hammer) - [1] [2]. Licensed under Public domain via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Henricus_Martellus%27_World_Map.jpg#mediaviewer/File:Henricus_Martellus%27_World_Map.jpg