I’m not really sure what I would pick out of the ones on this list. I find all of them fascinating. Personally I found the Persians to be rather interesting and they had a pretty cool system of roads that allowed for quick communication. Outside of this list I’m really not sure I could just pick a single favorite. However I do love learning about ancient Sumer and it’s city-states particularly Uruk, the home of the mythic King Gilgamesh. I find there culture to be really interesting as well as their architecture and influence they had on more popular civilizations that would follow them such as Babylon, Greece, and Rome.