https://whenitwas.com/collection/route66/cahokia-mounds.html
Cahokia Mounds | Bigger Than London in 1100 AD | When It Was
Cahokia Mounds - The largest pre-Columbian settlement north of Mexico. Route 66 passes by a city that was bigger than London in 1100 AD.
cahokia moundsbigger thanlondon