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America's World Heritage Sites

Thought you knew America? Think again. Take a tour of America's UNESCO World Heritage sites -- rich in natural beauty, individual genius and traditions that stretch back 1,000 years.

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Cahokia Mounds State Historic Site
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Cahokia Mounds State Historic Site
Before the Pilgrims, there were the Cahokia, an ancient, pre-Columbian people who made their home in what is now Illinois. Some 20,000 of them settled in a place called Cahokia Mounds -- a city that, in 1250 A.D., was the largest north of Mexico.

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