Harappa and Mohenja daro
10 Civilizations That Disappeared Under Mysterious Circumstances
10 Civilizations That Disappeared Under Mysterious Circumstances. Indus Valley Civilization One of the great civilizations of the ancient world is called simply the Indus or Harappan civilization. Thousands of years ago, it may have boasted up to 5 million people, almost 10 percent of the world's population, spread over a region that encompassed parts of today's India, Pakistan, Iran and Afghanistan.