The grid plan dates from antiquity; some of the earliest planned cities were built using grids. This article describes the first historical appearances of grid plans in various parts of the world.
Ancient Grid Plans
By 2600 BC, Mohenjo-daro in the Indus Valley (present-day Pakistan) was built with blocks divided by a grid of straight streets, laid out in perfect right angles, running north-south and east-west. Each block was subdivided by small lanes. Mohenjo-Daro was the largest of many grid-plan towns and villages that existed in the region from 2600-1900 BC.
Obeserving the urban planning of the Indus Valley civilization, archeologist B. B. Lal wrote, “Well-regulated streets [were] oriented almost invariably along with the cardinal directions, thus forming a grid-iron pattern. [At Kalibangan] even the widths of these streets were in a set ratio, i.e. if the narrowest lane was one unit in width, the other streets were twice, thrice and so on.”