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10 mysterious geoglyphs around the globe

Amazon geoglyph

Photo: Sanna Saunaluoma/Wikimedia Commons

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Amazonian geoglyphs

Since the 1970s, deforestation has revealed a complex network of mysterious ancient geoglyphs in the Amazon basin, possibly built by a lost Pre-Columbian civilization.

If this is true, it could completely rewrite the book on ancient cultures and population density of prehistoric South America.