Ancient cities were urban centers that emerged thousands of years ago, often serving as hubs for trade, culture, and governance. Examples include Babylon, Athens, and Rome, which were known for their impressive architecture, such as temples and public buildings. These cities played a crucial role in the development of civilization, allowing people to live in larger communities. Many ancient cities were strategically located near rivers or coastlines, facilitating trade and access to resources. They often featured complex social structures, with distinct classes and specialized professions. The ruins of these cities, like the Pyramids of Giza and Machu Picchu, provide valuable insights into the lives of early civilizations.