There are no other historic sites like this one on the planet. The concentric semi circles and mounds of Poverty Point in Louisiana are a mystery not only to those who come across them, but also to the archaeologists.

Don is joined by Tristram Kidder to find out what we do know about this late archaic site and the people who built it.

Produced by Freddy Chick and Sophie Gee. Edited by Siobhan Dale. Senior Producer was Charlotte Long.

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