In 1942, the U.S. Marine Corps recruited 29 Navajo speakers to create an unbreakable code to use in the Pacific Theater — and by the end of the war, more than 450 Navajo Code Talkers had helped the Allies to victory.

On February 14, 1929, seven members of Chicago's North Side Gang were killed in the St. Valentine's Day Massacre — and the prime suspect was Al Capone.

The sword was pulled from the attic decades ago, but a recent ceremonial cleaning revealed it was a priceless heirloom from the 12th century.

Reported to have lived 122 years and 164 days, Jeanne Calment was allegedly the longest-living human of all time — despite heavy consumption of chocolate, cigarettes, and red wine.

Hugh Glass dragged himself over 200 miles to the nearest fort after being mauled by a grizzly bear and left for dead by his fellow fur trappers. Then, he began his quest for revenge.

Dating back to ancient Greek writings, people have been avoiding the temple for fear of death.

The Megatherium roamed South America for 5.3 million years before it went extinct — though some Indigenous people claim to have seen a similar creature in the Amazon to this day.

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."

In 1979, 16-year-old Brenda Spencer shot up an elementary school in San Diego — then said she did it because she didn't like Mondays.

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.