One of the most fascinating and mysterious cultures of the ancient world is the Harappan civilization also known as Indus valley civiliza. This culture existed along the Indus River in present day Pakistan. It was named after the city of Harappa which it was centered around. Harappa and the city of Mohenjo-Daro were the greatest achievements of the Indus valley civilization. These cities are well known for their impressive, organized and regular layout. Over one hundred other towns and villages also existed in this region. The indus valley cities were very well planned.Houses were arranged in a row.The main streets ran parallel to each other,cut at right angles by smaller streets,dividing the cities into rectangular blocks.the main roads were straight and very wide and curved at the corners to allow carts to pass easily.the streets were often paved with baked bricks.