The Indus Valley — History's Greatest Enigma
The Indus Valley Civilization was one of the world's first urban civilizations — with planned cities, sophisticated sanitation, and a script no one has ever decoded.
The Indus Valley Civilization (also called the Harappan Civilization, 3300–1300 BCE) covered an area larger than ancient Egypt and Mesopotamia combined — spanning what is now Pakistan, northwest India, and Gujarat. Its major cities — Mohenjo-daro and Harappa — were among the most sophisticated urban environments of the ancient world: precisely planned on a grid, with covered drainage systems, standardized brick sizes, and multi-story residential buildings. The civilization was built on a sophisticated agricultural system using the Indus and its tributaries, and engaged in long-distance trade with Mesopotamia, Central Asia, and the Arabian Peninsula. Its greatest mystery is the undeciphered Indus script — approximately 400 distinct symbols that have resisted every attempt at decryption. The civilization declined around 1900 BCE, possibly due to climate change and the shifting course of the Indus River, and the migrating populations may have carried their culture and language into the Indo-Gangetic plains where later Vedic civilization emerged.