Between 1979 and 1981, at least 28 children and young adults were murdered across Atlanta. Was Wayne Williams their killer?

Mr. Rogers always wore long-sleeve sweaters, which made some people convinced he was hiding tattoos underneath them.

For more than a century, Danvers State Hospital supposedly offered humane medical treatment to patients confined to the psychiatric facility — but the reality was far darker.

After the release of the short film Submission, which criticized the treatment of women in Islam, Theo van Gogh attracted the ire of Mohammed Bouyeri — who took deadly revenge on November 2, 2004.

Pablo Escobar made many enemies during his time. Some of them decided to fight back and formed a paramilitary group known as Los Pepes to take down the Medellín Cartel.

Built into an ice sheet in Greenland in 1959, Camp Century was described as a scientific research facility, but it was actually constructed as part of the top-secret Project Iceworm to test whether it was feasible to hide nuclear weapons under the ice.

In the 1940s and '50s, British hangman Albert Pierrepoint made a career out of executing everyone from infamous serial killers to Nazi war criminals.

While descending Everest after a successful summit, Hannelore Schmatz succumbed to the harsh conditions — and her frozen corpse remained on the side of the mountain for years afterward.

George Everest wasn't a mountaineer and never laid eyes on Mount Everest — so how did the world's highest mountain come to bear his name?

Over four nights in August 1990, Danny Rolling viciously murdered five college students in Gainesville, Florida — and after he was caught, police discovered these weren't his first killings.