From Amelia Earhart to Percy Fawcett’s expedition to the Lost City of Z, the fate of these five explorers remains mysterious. Amelia Earhart poses for a portrait in an airplane circa 1936.

The dramatic moment was captured in a photo taken atop Iceland's Krafla volcano in 1984, during the fiery peak's final gasps of a multi-year-long eruption. Looking at the image, one can almost ...