<P> He was preparing an expedition to find "Z" when World War I broke out and the British government suspended support . During 1920 Fawcett undertook a personal expedition to find the city, but withdrew after suffering from fever and having to shoot his pack animal . During a second 1925 expedition, Fawcett, his son Jack, and Raleigh Rimell disappeared in the Mato Grosso jungle . </P> <P> David Grann wrote a 2005 article, "The Lost City of Z", on Fawcett's expeditions and findings, published in The New Yorker . He expanded and developed it into a full - length book of the same title, published in 2009 . That work was adapted as a movie of the same name and released in April 2017 . </P> <P> Researchers believe that Fawcett may have been influenced in his thinking by information he might have obtained from indigenous peoples about the archaeological site of Kuhikugu, near the headwaters of the Xingu River . Kuhikugu was discovered by Westerners after Fawcett's presumed death in 1925 in the jungle . It contains the ruins of an estimated twenty towns and villages in which an estimated 50,000 people could have once lived . </P>

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