Link to America before Columbus (episode 2) documentary
Documentary Description
History books traditionally depict the pre-Columbus Americas as a
pristine wilderness where small native villages lived in harmony with
nature. But scientific evidence tells a very different story: When
Columbus stepped ashore in 1492, millions of people were already living
there. America wasn't exactly a "New World," but a very old one whose
inhabitants had built a vast infrastructure of cities, orchards, canals
and causeways.