Here are six of the most vexing murder mysteries of all time:

1. Jack the Ripper terrorized London
A scene from Jack The Ripper, 1959.
A scene from Jack The Ripper, 1959. Paramount/Getty Images
London’s most notorious serial killer prowled the East End over a century ago, preying on prostitutes and terrorizing the area. He made his mark as Jack the Ripper by killing and mutilating at least five women. Dread grew as the dead bodies began to pile up near each other within a three-month period in 1888. The neighborhood was “horrified to a degree bordering on panic,” when news broke of a second female victim, The Morning Post reported at the time. The local newspaper called the killing “barbarous,” and said the manner of the murder was “too horrible for description.”

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