https://www.livescience.com/22737-cahokia.html – This Live Science article is an overview of the city of Cahokia. It discusses various aspects of their culture and society particularly focused on spirituality.
https://www.ancient.eu/Tiwanaku/ - Entry from the Ancient Encyclopedia about the city of Tiwanaku. It goes over the city layout, the worship center, artwork, and the collapse.
https://www.youtube.com/watch?v=HPRPaTqNnZk – Khan Academy video covering Mayan civilization and the city of Teotihuacan.