The Indus Valley Civilization was located in modern-day Pakistan and northwest India from 3300-1300 BCE. It featured large cities built with mud-brick houses along with sophisticated water and drainage systems. Trade was important, with goods imported and exported. While little is known about their culture and beliefs, the advanced nature of the IVC cities and infrastructure has led historians to describe it as one of the most advanced civilizations of its time. Preserving remains is important for continued research and study of this still mysterious Bronze Age society.