Which ancient civilization created Trajan's Market, often considered the world's first 'shopping mall' or department store with multiple specialized retail sections under one roof?

While we often think of department stores as a modern retail concept, the ancient world had surprisingly sophisticated retail environments. Various civilizations developed complex marketplaces and retail innovations that influenced commerce for centuries. This trivia question explores one of the earliest examples of organized multi-product retail spaces that resembles our modern concept of a department store.

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Ancient Romans
Ancient Egyptians
Mesopotamians
Ancient Greeks