Velma Barfield seemed like a sweet, God-fearing woman. In reality, she was a serial killer responsible for the deaths of as many as seven people, including three romantic partners and her own mother.

On October 26, 1881, lawman Wyatt Earp, his brothers Morgan and Virgil, and his friend Doc Holliday faced off against five outlaws in Tombstone, Arizona — culminating in the shootout at the O.K. Corral.

Tattooed in blue dye from head to toe, the Picts were an ancient people who once inhabited Scotland and turned back the Roman Empire.

From back-breaking manual labor to starvation rations, the Soviet Union's gulag camps inflicted horrific abuse upon their 18 million prisoners.

Florida's Skunk Ape is a Bigfoot-like mythical creature said to inhabit the state's swamps and allegedly stands seven feet tall and weighs 500 pounds.

The Wendigo of Native American lore, the Sphinx of ancient Egypt, the Kraken said to terrorize the ocean — discover these and more of the most riveting mythical creatures.

Richard Wershe Jr. uncovered the largest police corruption scandal in Detroit history when he was 15 years old. Two years later, he was sentenced to life in jail.

For 30 years, Boy Scout troop leader and church council president Dennis Rader was secretly the BTK Killer — while looking like the perfect family man to his neighbors in Kansas.

Throughout the 1930s, Louis "Lepke" Buchalter and Albert Anastasia led a vicious gang of hitmen who killed their rivals in gruesome ways — but one of Murder Inc.'s own members turned informer and led to the organization's downfall in the early '40s.

On May 25, 2012, Luka Magnotta shared a video online that depicted him brutally murdering and dismembering Jun Lin inside his Montreal apartment.

From Cleopatra's kingdom to "Japan's Atlantis," these cities sank beneath the water long ago, but the ruins they left behind continue to provide insight into what life was like for the people who lived in them.