According to the Project Blue Beam theory posited by Serge Monast, NASA and the United Nations are trying to establish a totalitarian, one-world government — but is there any proof?

Elsa Einstein was Albert Einstein's second wife as well as his first cousin — and she remained married to him despite his frequent affairs.

Described as the "perfect psychopath," Pedro Rodrigues Filho murdered at least 70 people — 47 of whom were fellow inmates in prison.

Starting in 1791, Alexander Hamilton had a year-long affair with Maria Reynolds. Five years later, he published "The Reynolds Pamphlet," detailing how she and her husband had extorted him.

Colleen Stan became known as the "girl in the box" after she was held prisoner by Cameron and Janice Hooker inside their California home between 1977 and 1984.

In July 1951, Mary Reeser mysteriously burned into a pile of ashes in her Florida home, but the apartment around her suffered almost no damage, leading to theories that she had spontaneously combusted.

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.

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.