In the history of our country, the construction of cities first began in Xia Dynasty. Ancient cities are called "city walls" and "pools" refer to Hechi, also known as "moats", which are ancient military defense buildings in China, South Korea and other East Asian countries.

The earliest cities in the world appeared in Egypt, Mesopotamia, Indus Valley, Yellow River Valley and Central America.

Egypt was the first country where cities appeared. Its cities originated around 3200 BC, but most of them no longer exist.

The earliest cities in China are in the center of Zhengzhou and the area around Beiguan. According to early written records, the city was built in the Xia Dynasty.