Beginning in 1978, Christian Gerhartsreiter took on numerous identities as he conned and killed his way into America's upper crust — then passed himself off as a distant relative of the Rockefeller family for 16 years.

Following a long downward spiral marked by substance abuse, Elvis Presley died of heart failure on August 16, 1977 in Memphis, Tennessee at age 42.

The Sahara was once a grassy woodland until human activity and a changing climate turned it into the immense desert we know today. The Berbers were the only people who decided to call it home.

Charles "Pretty Boy" Floyd managed to have a long criminal career in a relatively short life before being gunned down by the FBI in 1934.

Many Americans know the Hatfields and McCoys infamously didn't like each other, but just how bad was the animosity between these two families on the West Virginia-Kentucky border?

Nikola Tesla hated the idea of war and designed his death ray in the hopes that he could completely eliminate warfare.

Made famous as the openly gay drug lord depicted in "Narcos," the real-life Hélmer "Pacho" Herrera took the Cali Cartel to unparalleled heights of power and wealth in the 1980s.

The makeshift town of Slab City in the Colorado Desert might not be glamorous, but over 1,000 nomads call it home during the winter.

Black Bart may have staged the most dignified robberies of the Old West.

The Bloody Benders lured in weary travelers who were hoping for a place to sleep — and got much more than they bargained for.

Once called "the fool of Owari," Oda Nobunaga would eventually be known as the first "great unifier" of Japan.