From 1961 to 1971, the U.S. used the herbicide and defoliant Agent Orange in Vietnam, leaving behind millions of victims with deadly diseases and birth defects.

On August 14, 1980, Playmate of the Year and budding actress Dorothy Stratten was gunned down by her estranged husband. She was just 20 years old.

Tarrare, an 18th-century French showman, could eat enough to feed 15 people and swallow cats whole — but his stomach was never satisfied.

On a busy Saigon street in June 1963, Buddhist monk Thích Quảng Đức lit himself on fire and set off a chain of events that led to America's involvement in the Vietnam War.

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

In May 2012, Luka Magnotta murdered a university student named Jun Lin, chopped up his body, and mailed his limbs throughout Canada, then shared a video online of his crimes titled "1 Lunatic 1 Ice Pick."

Despite his mythic handicap, Ivar the Boneless was the most fearsome Viking of his time and conquered England with his heathen army.

Known informally as the Japanese mafia, the Yakuza are a 400-year-old criminal syndicate that carries out everything from human trafficking to real estate sales.

The "Swamp Sasquatch" known as the Florida Skunk Ape is a 6'6", 450-pound hairy, smelly ape that roams the Everglades — or so believers say.

Reinhard Heydrich had many nicknames: "the Blond Beast," "the Hangman," and "the Butcher of Prague" — but none of them quite captured just how ruthless he was.

When the end of Prohibition finally came with the ratification of the 21st Amendment in 1933, America kicked off perhaps the biggest impromptu party the country had ever seen.