The proliferation of crime documentaries on serial killers in popular culture might seem like a recent trend. But in reality, the macabre appeal of this genre has been enthralling audiences for over a century. This article features six spine-chilling documentaries that not only uncover horrific crimes but also examine the psychology of those who perpetrate them. Very few things bring viewers together, like an intriguing crime investigation on a mass murderer. Check out these sensational documentaries and get inside the minds of the world’s most notorious criminals.