The Indus Valley was home to one of the world's first large civilizations. It began nearly 5,000 years ago in an area of modern-day Pakistan and Northern India. A busy marketplace in the Indus Valley. There were more than 1,400 towns and cities in the Indus Valley. The biggest were Harappa and Mohenjo-Daro. Around 80,000 people lived in these cities. The names Harappa and Mohenjo-Daro were given to the cities in later times. We do not know what the Indus people called their cities, because nobody has been able to translate their ancient language.

The Indus Valley civilization was entirely unknown until 1921, when excavations in what would become Pakistan revealed the cities of Harappa and Mohenjo Daro. The ancient city in present-day Pakistan was the jewel of a flourishing civilization—and clues suggest its inhabitants were skilled urban planners. So what caused the decline of Mohenjo Daro? Mohenjo Daro, built at the time of the pyramids and centuries before the Roman Baths, was the largest city of the Indus Civilization. A well-planned street grid and an elaborate drainage system hint that the occupants of the ancient Indus civilization city of Mohenjo Daro were skilled urban planners with a reverence for the control of water. But just who occupied the ancient city in modern-day Pakistan during the third millennium B.C. remains a puzzle.

"It's pretty faceless," says Indus expert Gregory Possehl of the University of Pennsylvania in Philadelphia.

The city lacks ostentatious palaces, temples, or monuments. There's no obvious central seat of government or evidence of a king or queen. Modesty, order, and cleanliness were apparently preferred. Pottery and tools of copper and stone were standardized. Seals and weights suggest a system of tightly controlled trade. (These archaeological findings unlocked the stories of our ancestors.)

The city's wealth and stature is evident in artifacts such as ivory, lapis, carnelian, and gold beads, as well as the baked-brick city structures themselves.

A watertight pool called the Great Bath, perched on top of a mound of dirt and held in place with walls of baked brick, is the closest structure Mohenjo Daro has to a temple. Possehl, a National Geographic Explorer, says it suggests an ideology based on cleanliness.

Wells were found throughout the city, and nearly every house contained a bathing area and drainage system.
City of mounds

Archaeologists first visited Mohenjo Daro in 1911. Several excavations occurred in the 1920s through 1931. Small probes took place in the 1930s, and subsequent digs occurred in 1950 and 1964.

The ancient city sits on elevated ground in the modern-day Larkana district of Sindh province in Pakistan.

During its heyday from about 2500 to 1900 B.C., the city was among the most important to the Indus civilization, Possehl says. It spread out over about 250 acres (100 hectares) on a series of mounds, and the Great Bath and an associated large building occupied the tallest mound.