60 Most Mysterious Places On The Earth That You Should Visit

Cahokia

On the other side of the Mississippi River from St. Louis there was a thriving city with 20,000 American Indians coming from various cultures. It happened to be North America’s biggest and most refined city. Amazingly, in those times the population of this city was as large as of European cities such as London. However, not much is known about this settlement as the city people did not hold records of the events.