The Complete and Concise History of the Sumerians and Early Bronze Age Mesopotamia (7000-2000 BC)

 https://www.youtube.com/watch?v=szFjxmY7jQA

Various ancient civilizations had several interesting and peculiar things about them.

The Sumerians - Fall of the First Cities https://www.youtube.com/watch?v=d2lJUOv0hLA