Upcoming episodes, programme details and where to watch over the next seven days. All times are UK time.
Iceland's Glacier Tomb: In Russia, 34,000-year-old graves are discovered. A team attempts to locate a World War II British plane that went missing in Iceland.
Antarctic Island Mysteries: A volcanic island off the coast of Antarctica with a mysterious past is explored.
Forgotten Greenland Ghost Town: Mysterious industrial waste and abandoned homes are discovered in a remote, uninhabited part of Greenland.
Abandoned Alpine Fortress: A Kazakh farmer discovers ancient burial sites that may determine whether or not the legend of the Amazon women warriors is myth or reality.