In less than 100 days, Finnish sniper Simo Häyhä killed at least 500 enemy troops during the Winter War — earning him the nickname the "White Death."

Almost 500 years after the society crumbled, researchers have finally discovered what happened to the Aztecs.

Made famous as Jimmy "The Gent" Conway in "Goodfellas," real-life New York gangster Jimmy Burke was even more ruthless than his onscreen counterpart.

"Silent twins" June and Jennifer Gibbons spoke only to each other, used their own special language, and mirrored each other's behavior for three decades straight.

After John List murdered his wife, mother, and three children in 1971, he assumed a different identity, remarried, and started a new life — until an episode of America's Most Wanted finally led police to him in 1989.

When a fire erupted inside the coal mine in Centralia, residents thought it would quickly burn out on its own. But the blaze is still going six decades later and the state has given up on trying to fight it.

Bruce McArthur brutally murdered eight gay men between 2010 and 2017 — then hid their remains in potted plants.

In the late 19th century, Amelia Dyer took in untold numbers of babies for a fee, promising their desperate parents she’d use the money to take good care of them. Instead, she pocketed the money — and brutally murdered the children.

Did 14-year-old Caril Ann Fugate help Charles Starkweather kill 10 people across Nebraska and Wyoming in January 1958 — or was she one of his victims?

Presented as a means for assessing whether voters were educated enough to vote, literacy tests and other methods were designed for a single purpose: to stop Black Americans from voting.