A mysterious wooden carving pulled from a Polish island lake hints at ancient spiritual protection rituals. Treasure recovered from a sunken Spanish galleon in the Bahamas raises new questions about one of history's richest shipwrecks. Burned bones and tools discovered in a Sicilian cave challenge long-held beliefs about early human migration. And a remote island in the Indian Ocean reveals one of the last uncontacted tribes on Earth, and the dangerous history that may explain their isolation.