Robert Graysmith was the political cartoonist at the San Francisco Chronicle when the Zodiac Killer began sending encrypted letters to the newspaper, and he soon became so obsessed with the case that he spent decades writing books on the crimes and trying to identify the culprit himself.

Ed and Lorraine Warren were famous paranormal investigators, demonologists, and a seemingly happy married couple. Were they also abusers?

During excavations in the foothills of the Bozdağ Mountains, researchers unearthed pots featuring lids inscribed with dog skulls — and containing the headless remains of infants who were buried in what's believed to be a previously unknown religious ritual.

From the booze-guzzling clurichaun to the bloodsucking Abhartach, these Irish folklore creatures paint a fascinating picture of pre-Christian mythology in Ireland.

The Zodiac Killer murdered at least five victims in Northern California between 1968 and 1969 — and we still don't know who he is.

So far, archaeologists have uncovered 139 graves with the remains of both humans and animals, a trove of artifacts, and even evidence of several ship burials.

The 1986 FBI Miami shootout​ left two bank robbers and two agents dead and wounded five others, leading to a wave of changes in FBI training and weaponry that would contribute to the widespread militarization of American law enforcement.

Archaeologists digging at Al-Khazneh, featured in Indiana Jones and the Last Crusade, uncovered an ancient tomb filled with 12 skeletons — and one of them was clutching a vessel that looks remarkably like the Holy Grail depicted in the film.

John Wayne Gacy began performing as Pogo the Clown in the Chicago area in 1975 — right in the middle of his gruesome murder spree.

Thomas Kwan reportedly wanted to kill his mother's partner of 20 years, Patrick O'Hara, over an inheritance dispute — so he injected him with a toxin that caused him to develop necrotizing fasciitis.