Mohenjo-daro and Harappa are the known twin capitals in Indus Valley. Both cities were planned and built in grid pattern with wide roads dividing them.

One important feature in Mohenjo-daro and Harappa was the sewage system where the sewage from houses emptied into brick channels that ran along the city's streets.

Most of the Indus writing were found on stone seals - carvings that were used to make an impression on soft clay.

Merchants from Indus Valley probably sailed from Lothal to Dilmun where they met up with traders from Sumer.

The citadel - a raised, fortified area that overlooked the city is believed to be the place where local leaders lived.

The government collected grains as a form of tax. The collected grains were used in a huge granary and used in times of famine.

The citadel had a big pool called the Great Bath believed to be used for religious ceremonies.

The Great Wall of China was built over a hundred of years to keep the people safe from raiders.

Many people in China grew rice in irrigated fields.

Thousands of bones from the Shang dynasty have writings on them. These are called oracle bones. The early Chinese writing found in these bones was in the form of picture symbols.

The Chinese built blast furnaces to forge cast iron. This helped them create stronger weapons and better farm tools.

Under the Chinese kingdom, education was highly prized and the arts, especially music and painting, grew and flourished.

The first emperors ordered the building of a huge canal network that linked the country together.

Qin Shi Huangdi divided the country into districts and appointed officials to make sure that everything was run efficiently.