The sophistication of ancient civilizations such as the Roman and Greek is not comparable to that of the Indus Valley civilization.
The Indus Valley civilization spanned 800,000 square kilometers and included over a thousand settlements.
The society likely had a population of about a million people and was on par with other major ancient empires.
Indus merchants were among the first examples of globalization and traveled to the Middle East.
The Indus Valley civilization was one of the largest, most advanced civilizations in the ancient world. But we barely know anything about them, in large part because we haven’t been able to decipher the cryptic symbols they left behind.