Greatest Ancient Metropolises

Behind every great empire there is a central metropolis, driving expansion and governing the great empires that called these cities home - hubs of technology, politics, engineering and massive populations comparable to cities of today. From the grandeur of Rome to the intellectual seat of Alexandria to the legendary home of democracy, Athens, the ancients built cities that would leave their mark on history. But which of these Top 10 ancient metropolises will take the crown as most renowned?