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Some are buried in mass graves; others are still in the hands of Islamic State militants. Kate Adie introduces stories from Iraq, Chile, India, Colombia, and Sweden:
Four years since IS swept through northern Iraq and carried out what the UN called a genocidal attack on the Yazidi people who lived there, Lyse Doucet returns to see what remains.
Linda Pressly meets a Chilean woman who posed as a young boy online in her quest to get her local priesthood investigated.
Vivienne Nunis learns how women and their pink rickshaws are transforming the working world in Jaipur - much to the disapproval of some local men.
Nick Thorpe makes the long journey through the Sierra Nevada de Santa Marta mountain range to reach the Ciudad Perdida – the Lost City which was abandoned by the indigenous people who once lived there when Spanish conquistadors arrived at the Colombian coast in the 16th century.
And Gabriel Gatehouse has a mysterious but revealing encounter with a real-life troll in Stockholm.