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.

From 1969 to 1980, Colombian serial killer Pedro Lopez raped and murdered up to 300 children — and no one knows where he is today.

On the afternoon of July 26, 2009, Diane Schuler sped the wrong way on the Taconic State Parkway and crashed into another car, killing eight people.

A pioneering British explorer, George Mallory hoped to become the first man to reach the summit of Mount Everest — and we still don't know if he accomplished his goal.

From serial killers like Ted Bundy and Jeffrey Dahmer to the slayings of the Manson Family, these real crime scene photos capture history's grisliest murders.

Though he was executed in 1936 for the murder of Grace Budd, serial killer Albert Fish claimed he killed 100 victims and "had children in every state."

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.

Between 1978 and 1990, Andrei Chikatilo murdered at least 53 people and mutilated their bodies — all while slipping right through the authorities' fingers on multiple occasions.

In April 2014, two Dutch tourists named Kris Kremers and Lisanne Froon went hiking in Panama and never returned. Months later, officials found their bleached bones and disturbing pictures.

A serial killer who murdered four girls in late 1980s Japan, Tsutomu Miyazaki was known as the "Otaku Killer" for his obsession with anime and pornography.

From Elisa Lam to Richard Ramirez, the Cecil Hotel's history has been filled with bizarre horrors since it was built in 1924.