This title crossed my mind after watching The Lost City of Z. Thus the character of Col. Percival Fawcett, played by Charlie Hunnam when he mentions the existence of an old culture in the Amazon River region, but is doubtful by the majority of scholars at the Royal Geographical Society.
Fawcet did not give up easily. He presents evidence of artifacts or pottery to corroborate his arguments in the meeting. He is also willing to return to the most dangerous areas of the world with his partner, Henry Costin (Robert Pattison). In fact, in their last expedition, Fawcet's and crew's lives almost disappeared.
The Amazon forest stretching from Bolivia to Brazil was known wildly at the time. No one has survived, especially for explorers tracing the Amazon. However, unlike Fawcet and Costin. This small team managed to create a new map line to finally suspect the old culture in this region.
James Gray's movie storyline is interesting. I recommend you to watch it.