Three-year-old Madeleine McCann is seen in this undated photograph released May 4, 2007.
#3. The Disappearance of Madeleine McCann
On the night of May 3, British tourists Kate and Gerry McCann left their three young children asleep in a Portuguese resort while they dined nearby. When they returned, 3-year-old Madeleine was gone. So began a mystery that continues to befuddle investigators. David Beckham and other celebrities were enlisted to help find the girl amid theories that she might have been kidnapped by international pedophile gangs. The McCanns were eventually named as suspects after tiny amounts of the girl's bodily fluids were found in a car her parents had rented several weeks after she went missing. The McCanns claim the evidence is inconclusive.