What He Saw in China

Marco Polo didn't just visit China. He served Kublai Khan for years as the emperor's eyes and ears across the empire, and he came home describing things Europeans had never seen:

• Paper money — entire economies running without gold coins
• Coal — "black stones" burned for heat that Europeans thought was witchcraft
• A postal system — thousands of relay stations spanning the empire

The paper money stunned readers most. China backed printed notes with the authority of the Khan, not the weight of metal — a riderless courier could carry a fortune in a satchel, no gold required. To Europe, where wealth meant something you could bite, the idea sounded like a magic trick.