Though Freddie Mercury and Mary Austin never officially married, they were engaged for six years before he joined Queen and became a superstar.

Despite his heroic actions in World War I, U.S. Army soldier Henry Johnson didn't receive his due until 2015 — 86 years after he died in obscurity and poverty.

Due to two centuries of inbreeding, the Habsburg family was ravaged by extreme physical deformities, including impotence, bowed legs, and the infamous Habsburg jaw.

The father of Adolf Hitler, Alois Hitler was a domineering, unforgiving husband who often beat his wife and his children — leading his son to despise him.

Thanks to a strong constitution and some liquid courage, baker Charles Joughin survived nearly three hours in the frigid North Atlantic after the Titanic sank.

The devoted mother of Adolf Hitler, Klara Hitler died of cancer in December 1907 while in the care of a Jewish doctor, leading some to speculate that this tragedy set the future dictator on his deadly path.

The fortress was specially constructed on a foggy mountainside to keep Escobar's enemies out — and not the cocaine kingpin in.

Paul Avery was a top reporter for the San Francisco Chronicle reporting on the infamous Zodiac killings. But after making a break in the case, the killer took to tormenting him with letters and cards.

From 180 to 192 C.E., Emperor Commodus ruled ancient Rome with an insatiable lust for power that brought an end to the fabled Pax Romana.

In the early 14th century, Robert the Bruce became the King of Scots and ensured his country's independence after repulsing several English invasions.

From Kenny the tiger to Otto the kitten, you've probably seen content about animals with Down syndrome. But what's the truth about their conditions?