(CNN)When David Grann lost his guide deep in the Brazilian Amazon, fear took hold.
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Fawcett pictured in 1911 on his fourth expedition.
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Fawcett mapping the border between Bolivia and Brazil in 1908.
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Charlie Hunnam as Lt. Col. Percy Fawcett in “The Lost City of Z.”
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Fawcett was considered radical in his day for taking a diplomatic approach with Amazonian tribes.
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Archaeologist Michael Heckenberger and Kuikuro chief Afukaka.
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Jack Fawcett on 1925’s fateful expedition.

