30 Unusual Archaeological Finds In The US We Still Can’t Explain

18. A TOWN THAT JUST DISAPPEARED

One of the strangest archaeological sites in America is a pre-Columbian city called Cahokia. Ancient people, known as Mound Builders, built the city and inhabited the area from about A.D. 700 to 1400. Archaeologists unveiled over 120 earthen mounds and burial sites, but the mystery is no one knows what happened to the people as they vanished from the city. Theories include war, drought, diseases, and climate change. There are no records or legends from other tribes about what happened.