Just finished
The Lost City of Z by David Grann. About an explorer of the Amazon who made several trips in the early 1900s mapping the completely uncharted territory and looking for the legendary city of El Dorado. He disappears on one trip and scores of rescue parties try to find him. They all disappear too. Grann uncovers new information about his final ill fated expedition from recently released archive documents and personal diaries collected from family members, and sets off to the Amazon to see if he can find out what happened to this guy. It's a pretty interesting book.