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 ...

Was ancient America one of the most dangerous places ... the greatest pre-Columbian cities north of Mexico, Cahokia. Home to 20,000 people, Cahokia faced a series of catastrophic floods that ...

Weitzel also noted that the Natchez Trace itself was an ancient Native American road ... famous Native American site in the eastern U.S., Cahokia was a thriving urban center between the 11th ...