Cahokia: Cahokia was a major ancient city of the Mississippian culture, known for its large earthen mounds in present-day Illinois.
Serpent Mound: Serpent Mound is an effigy mound shaped like a serpent located in Ohio. It is one of the most famous examples of mound-building cultures.
Effigy Mounds: Effigy mounds are earthworks shaped like animals or other figures created by Native American cultures. They served various purposes such as burial sites or ceremonial grounds.