World Map by Henricus Martellus, 1489
Henricus Martellus, a skilled German geographer and cartographer who worked in Florence around 1480 to 1496, created an intriguing map of the world. Some historians believe that Christopher Columbus used this map to convince Ferdinand II of Aragon and Isabella I of Castile to finance his 1492 voyage. The British Library digitized Martellus’s old map and put it into perspective by overlaying it on the current World Map. You can view it here.