From an upcoming film on Uncontacted Tribes in the Amazon:
Also brings to mind a recent best-seller, "The Lost City of Z" by David Grann, about one of the last "romantic" explorers in the early part of the last century: Percy Fawcett. Fawcett, having explored much of the Amazon, left in 1925 on a search for El Dorado -- the Lost City of Gold. He, his son, and a friend disappeared into the Amazon jungle, and were never heard from again.
The book chronicles a latter-day effort to retrace Fawcett's footsteps, which brings the author all-too-close to repeating Fawcett's experiences. The result is a compelling read.