08:50Witness HistoryNok Terracottas: Nigeria's Ancient TreasureBBC World Service Duration: 9 minutes Mon 11th Sep 2017, 08:50 on BBC World Service Americas and the CaribbeanAvailable for over a yearListen nowWest Africa miners unearthed evidence of a lost civilization Show more GenresNewsFormatsMagazines & ReviewsBrandWitness History Source: BBC Online