Ismael "El Mayo" Zambada García took over the Sinaloa Cartel after Joaquín Guzmán's arrest in 2014. But unlike his predecessor, El Mayo remains at large despite a $15 million bounty for his capture.

Doreen Lioy was a successful woman who worked as an editor of Tiger Beat — until she married one of the worst serial killers in American history.

On August 11, 2014, Robin Williams died by suicide in Paradise Cay, California. An autopsy later showed that he had Lewy body dementia — a debilitating brain disease.

On May 11, 1981, reggae icon Bob Marley died due to a rare form of skin cancer that had gone tragically untreated for years.

When Susan Powell vanished in December 2009, police found her phone in her husband's car along with her blood in their house. Three years later, Josh Powell killed their two sons before taking his own life.

Between 2005 and 2008, Gary Hilton stalked hiking trails across the American South, searching for people to mutilate. He took at least four victims before he was finally caught.

After abusive Washington mom Shelly Knotek was convicted of killing two of her boarders in 2004, she was sentenced to just 22 years in prison — then served just 18.

Dating back nearly 12,000 years, history's oldest man-made structures provide valuable insight into the first steps of civilization.

From Alexander the Great being buried alive to a Jameson heir paying to watch a girl be cannibalized, these true horror stories go way beyond Rated R.

Whether it's serial killers, cannibals, or disturbing beasts, the only thing more chilling than these scary photos from decades past are the terrifying stories behind them.

From the true story behind The Conjuring to the murders that inspired The Amityville Horror, these real ghost stories might make even the skeptics believe in the paranormal.