Inside a Cemetery H burial urn, a potter in 1700 BC painted a procession of peacocks around the rim and placed a hollow bird at the center. What he put inside it has never been explained. The Indus Valley Civilization was already emptying by then — cities half-abandoned, drainage channels silting over, the monsoon arriving later each year with less water than the year before. The end did not come as a collapse. It came the way a harvest fails. Part 2 of 2.

Every civilization of this scale left a ruler behind. Egypt left pharaohs. Mesopotamia left kings. The Indus Valley — larger than both combined — left a drainage system. The civilization that standardized its bricks across eight hundred kilometers, kept clean water flowing beneath a million people for seven centuries, and never, as far as we can tell, needed a throne to do any of it. Part one of two.

A civilization that flourished for a thousand years left no written record — only bronze masks with eyes that extended sixteen centimeters from the face. They built a city of thirty thousand people on the Chengdu Plain, cast bronze trees nearly four meters tall, and then burned their most sacred objects in sealed pits and disappeared from the historical record entirely. An hour of ancient history and forgotten civilizations, told for sleep. No answers. They have not stopped looking.