Christopher Scarver didn't like fellow inmate Jeffrey Dahmer's sickening crimes — so on November 28, 1994, he did something about it.

Mary Jane Kelly was an enigmatic figure with a mostly unverified story. What was clear, though, was the horrifying nature of her murder.

Mel Ignatow killed his girlfriend Brenda Sue Schaefer in 1988 and managed to get away with it. Two decades later, however, he met a grisly fate eerily reminiscent of that murder.

One of the most calculating serial killers in British history, Graham Young started poisoning his victims when he was just 14 years old and kept a meticulous diary of his crimes.

An infamous punishment used to maintain order at sea in the 17th and 18th centuries, keelhauling was when sailors would be dragged under ships as punishment.

Operation Anthropoid, a secret plan to kill Reinhard Heydrich in 1942, was the only successful assassination of a top Nazi officer during World War II.

Literally translating to "rotting cheese," casu marzu is a traditional Sardinian pecorino made with sheep's milk — and filled with live maggots.

Tara Calico disappeared in Belen, New Mexico on September 20, 1988. A year later, two Polaroids of a tied-up woman were discovered in Florida — was it her?

Born in Plympton, Massachusetts in 1760, Deborah Sampson became a hero of the American Revolution after posing as a man to join the Continental Army.

In the late 1970s, serial killer Richard Chase murdered at least six people in Sacramento, California — and drank the blood of his victims.