"In 1459 a Venetian monk named Fra Mauro completed an astonishing map of the world. Seven feet in diameter, Fra Mauro's mappamundi is the oldest and most complete Medieval map to survive into modernity. And in its time, this groundbreaking mappamundi provided the most detailed description of the known world, incorporating accurate observation, and geographic reality, urging viewers to see water and land as they really existed. Fra Mauro's map was...