Hellenistic art
One of the things that made the Hellenistic time different from other times was the division of Alexander the Great's country into smaller parts.  In every part there was a family of leaders.  The Ptolemies had Egypt; the Seleucids had Mesopotamia, the Attalids had Pergamon, and other leaders had other parts.  Every family of leaders gave money for art in a way that was different from the way the city-states did it.  They made big cities and complex groups of buildings in a way that most city-states had already stopped doing by 500 BC.  This way of making buildings was new for Greece.  This way was not to try to change or fix a natural place, but to make the buildings fit the natural place.  There were many places for pleasure, for example many theatres and places to walk.  The Hellenistic countries were lucky because they had much empty space where they could make big new cities.  Some of their new cities were Antioch, Pergamon, and Seleucia on the Tigris.