World globes, empire, and the making of the world

A world globe looks like a simple object, but look closely and you can see centuries of discovery, error, ambition and empire. The blank spaces, the imaginary islands, the borders and flags all tell us something about what people knew, and what they thought they knew.Guest: Nikolaus Schobesberger, Director at the Globe Museum of the Austrian National Library, Vienna Producer: Ali Benton