Between 4000-2000 B.C., Egypt and Mesopotamia were the focal points for engineering activity. Stone tools were developed to  help man in his quest for food. Mesopotamia also made its mark on engineering by giving birth to the wheel, the sailing boat, and methods of writing. Egypt also created the Step Pyramid of Sakkara and the Great Pyramid of Khufu.

Great Pyramid of Khufu:

Step Pyramid of Sakkara:*

Stone tools:

YouTube link to Mesopotamia: