Poveglia, a small island near Venice, Italy, is investigated; an exploration of Japan's Battleship Island reveals a troubled history; strange trees are found on the Yemeni island of Socotra; on Indonesia's Flores Island, a skull is found in a cave.
A headless skeleton is discovered on Australia's Beacon Island; near the Marshall Islands, a huge undersea crater is discovered; in Mexico, an island full of dolls reveals a grim history; animal bones are found on an island in the English Channel.