It was and still is a great way for culture exchange and to showcase there countrys strength wit people from there country in many events.
An Acropolis in a high point in every Greek city and put famous buildings to worship their gods on them.
A Democracy was a great idea because it allowed the Greek to vote for a leader.
Alexander was a great man and started many empires and historically famous buildings.
Pliny the Elder was a great scientist and the author of many books but his most famous one was 37 Volumes of Natural History which recorded plants and animals.