Its remains rest almost unnoticeable near the small village of Rakhigarhi in northwest India. On the surface, its most visible features consist of well-ordered mounds of cow dung cakes, nature's fertilizer for the present-day local villagers' farming operations. Ox carts routinely transport their agricultural supplies over its ancient mounds and into the fields every day. Below the surface, however, lay an expansive network of ruins and artifacts that would betray an ancient city that would rival, and likely exceed, the enormity of the Indus Valley civilization's best known archaeological site, Mohenjo-Daro. At 224 hectares, it is the largest known Harrapan (Indus Civilization) site in India....