I won't go into the details because there are many, but the most interesting thing about the Spartans in my opinion was their system of government. All citizens had a say in running the country. There was a supreme council that included five new members each year that were based on random drawls (there were around 8,000 citizens). This way no one would have a political career and have to play political games to get elected or re-elected. No one would try to hitch their livelihood wagon so to speak on to one particular person because no one had a clue who would end up with influence the coming year. Their system of government wasn't perfect as it ultimately failed but I find it very interesting.