Part 1: Indus Valley — The Unbroken Seals

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.