Ariane takes Nino to... ancient China, where the great Emperors decide there's only one way to keep invaders out: build a wall. Not just one wall, but 16 of them, with a total length equivalent to half of the Earth's circumference! Safe behind its walls (most of the time), China becomes one of the world's great civilizations... only no one else knows about it until the 18th century, when its secrets begin to be discovered. But, as Nino himself discovers, these days there are some invaders even the greatest walls can't keep out: tourists!