哥伦布前的美洲

NationalGeographicembarksonanexpeditionintothemysteriousworldofancientAmericanhistorytoshedadifferentlightonthehistoryoftheAmericas.　　Historybookstraditionallydepictthepre-ColumbusAmericasasapristinewildernesswheresmallnativevillageslivedinharmonywithnature.Butscientificevidencetellsaverydifferentstory:WhenColumbussteppedash...