This story appears in the January 2011 issue of National Geographic magazine. If they ever build a Wal-Mart at Machu Picchu, I will think of Collinsville Road. I'm standing at the center of what ...

At the heart of Cahokia stands Monks Mound, the "largest prehistoric earthwork in the Americas" according to UNESCO. This awe-inspiring mound covers more than 14 acres at its base and soars to a ...

In the American Midwest, a mysterious location exhibits the ancient ingenuity of the indigenous people of North America. The Cahokia Mounds site stands on the other side of the river from what is ...