Write a summary of the following passage (5-6 sentence).
Mohenjo-daro is nearly 400 miles to the north of Karachi and on the bank of the river Indus. It is on of the oldest circles of the world. Few people live there today but4,000 years ago, it was a large, busy city. Nobody knew about it 1992 when some villagers found some old pots and old bricks from the city. They took them to sir John Marshall. He was interested in history, in ancient buildings and in old things. When he had looked at them, he said,” Perhaps they come from an old city. Perhaps there was once a town or a city at this place. Let us dig there. When we dig and take away the sand, perhaps we shall uncover the buildings of an old city. “ In this way the course of time uncovers civilization