The second husband of actress Fanny Brice, Nicky Arnstein was a conman, a criminal, and one of the great loves of Brice's life.

Low oxygen levels, frigid temperatures, high winds, and frequent avalanches make Mount Everest's Death Zone one of the world's most lethal places.

The Britannic sank after it struck a German naval mine during World War I, and it took almost 60 years for its wreck to be located off the coast of Greece.

After they were stranded on the island of 'Ata in 1965, the Tongan castaways survived for more than a year by working together and dividing up responsibilities.

The inspiration for Bill Tench on Mindhunter, Robert Ressler interviewed dozens of murderers during his career with the FBI and came up with the very first serial killer profiles.

The chainsaw was invented to more safely perform a brutal surgery known as a symphysiotomy on laboring women, during which the birth canal was widened with a hand-cranked, rotating blade.

When four employees vanished while closing up their restaurant in Speedway, Indiana on November 17, 1978, the police assumed they'd run off with the day's cash — but then they were found murdered.

Just a year after she was born in 1902, Albert Einstein's daughter Lieserl Einstein suddenly vanished from the historical record — and until 1986, no one even knew she existed.

The author of Think and Grow Rich, Napoleon Hill claimed to have interviewed Andrew Carnegie and advised Woodrow Wilson — with zero evidence.

It was once almost universally accepted that Robert Peary was the first man to make it to the North Pole in 1909, but a re-examination of his records in the 1980s cast serious doubt on his claim.