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The first European to travel the length of the Amazon River was Francisco de Orellana in 1542. BBC's Unnatural Histories presents evidence that Orellana, rather than exaggerating his claims as previously thought, was correct in his observations that a complex civilization was flourishing along the Amazon in the 1540s. <unk> Orellana, rather than exaggerating his claims as previously thought, was correct in his observations that a complex civilization was flourishing along the Amazon in the 1540s. It is believed that the civilization was later devastated by the spread of diseases from Europe, such as smallpox. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Ondemar Dias is credited with first discovering the geoglyphs in 1977 and Alceu Ranzi with furthering their discovery after flying over Acre.<unk> Ondemar Dias is credited with first discovering the geoglyphs in 1977 and Alceu Ranzi with furthering their discovery after flying over Acre.<unk> Ondemar Dias is credited with first discovering the geoglyphs in 1977 and Alceu Ranzi with furthering their discovery after flying over Acre. Unnatural Histories of the BBC presented evidence that the Amazon rainforest, rather than being a pristine wilderness, has been shaped by man for at least 11,000 years through practices such as forest gardening and terra preta.