Final answer:
Great Zimbabwe was a capital city built of stone, serving as the center of a trade-based civilization in South Africa.
Step-by-step explanation:
Great Zimbabwe was a capital city built of stone. It was an advanced trade-based civilization that existed between the thirteenth and sixteenth centuries in South Africa. The city, which was home to about 25,000 inhabitants, had a hierarchical society with a ruling elite living in a fortress on top of a hill. Great Zimbabwe was also a major center of trade, connecting inner Africa to trading communities around the Indian Ocean.