From 1405 until 1433, the Chinese imperial eunuch Zheng He led seven ocean expeditions for the Ming emperor that are unmatched in world history. These missions were astonishing as much for their distance as for their size: during the first ones, Zheng He traveled all the way from China to Southeast Asia and then on to India, all the way to major trading sites on India's southwest coast. In his fourth voyage, he traveled to the Persian Gulf. But for the three last voyages, Zheng He went even further, all the way to the east coast of Africa. This was impressive enough, but Chinese merchants had traveled this far before. What was even more impressive about these voyages was that they were done with hundreds of huge ships and tens of thousands of sailors and other passengers. Over sixty of the three hundred seventeen ships on the first voyage were enormous "Treasure Ships," sailing vessels over 400 hundred feet long, 160 feet wide, with several stories, nine masts and twelve sails, and luxurious staterooms complete with balconies. The likes of these ships had never before been seen in the world, and it would not be until World War I that such an armada would be assembled again. The story of how these flotillas came to be assembled, where they went, and what happened to them is one of the great sagas — and puzzles — in world history.