Rome, the capital of the Roman Empire, was often referred to as the "City of Seven Hills" due to its location on seven hills.

Athens, a prominent city-state in ancient Greece, was renowned for its democratic system of government and significant contributions to philosophy, art, and literature.

Sparta, an ancient Greek city-state, was famous for its disciplined military and rigorous social system, emphasizing physical fitness and military training.

Babylon, an ancient city-state in Mesopotamia, was renowned for its sophisticated system of writing, the Babylonian cuneiform, and its influential legal code, the Code of Hammurabi.

Tyre, an ancient Phoenician city-state, was a prominent center of trade and maritime commerce, known for its skilled sailors and merchants.

Mohenjo-daro, an ancient city-state in the Indus Valley, was notable for its sophisticated urban planning, featuring a grid system of streets and an elaborate water management system.

Tikal, an ancient Mayan city-state in Guatemala, was a major center of the Mayan civilization, renowned for its impressive architecture, including towering temples and plazas, and its advanced calendar system.

Caral, an ancient city-state in Peru, is considered one of the oldest cities in the Americas, known for its impressive stone structures and advanced agricultural techniques, including irrigation systems.

Timbuktu, an ancient city-state in Mali, was a major center of trade and cultural exchange in West Africa, known for its diverse population, impressive architecture, and role as a center of Islamic scholarship.

Angkor, an ancient city-state in Cambodia, was the capital of the Khmer Empire, known for its impressive temple complex, including the famous Angkor Wat, and its advanced hydraulic engineering, including an extensive system of canals and reservoirs.

Anuradhapura, an ancient city-state in Sri Lanka, was renowned for its advanced irrigation systems, including the construction of massive reservoirs and canals, and its sophisticated urban planning, featuring a grid system of streets and well-organized public spaces.

Benin City, an ancient city-state in Nigeria, was known for its impressive earthworks, including massive city walls and moats, and its advanced ironworking techniques, producing intricate sculptures and ceremonial objects.

Great Zimbabwe, an ancient city-state in Zimbabwe, was the capital of the Kingdom of Zimbabwe, known for its impressive stone architecture, including massive stone walls and enclosures, and its extensive trade networks, reaching as far as the coast of East Africa.

Lalibela, an ancient city-state in Ethiopia, is renowned for its unique rock-hewn churches, carved out of a single piece of rock, and its advanced agricultural techniques, including the use of terracing and irrigation systems.

Meroe, an ancient city-state in Sudan, was the capital of the Kingdom of Kush, known for its advanced metallurgy, producing iron tools and weapons, and its extensive trade connections, reaching as far as the Mediterranean Sea.