Once a bustling coal mine — and the site of horrific forced labor — Japan's Hashima Island was abandoned in the 1970s, and its many buildings have fallen into a state of neglect.

The Harpe brothers killed indiscriminately across Appalachia between 1797 and 1799, murdering at least 39 men, women, and children.

American troops were shocked by the death and suffering they found at Dachau while liberating the camp in April 1945 — and they responded by massacring dozens of SS guards.

Wealthy socialite Barbara Daly Baekeland attempted to "cure" her gay son by getting him to sleep with her, then Antony Baekeland stabbed her to death on November 17, 1972.

Sometimes referred to as "Sea Nomads," the Bajau people traditionally live on houseboats or in stilted huts above the water — and spend up to eight hours a day fishing and diving.

While serving a 20-year sentence for killing his lover, Alfredo Ballí Treviño met journalist Thomas Harris, who would later use Treviño as inspiration for the character of Hannibal Lecter in his book The Silence of the Lambs.

In 1980s California, Dorothea Puente's house was a den of theft and murder as this predatory landlady killed at least nine of her unsuspecting tenants.

Peter Sutcliffe claimed to be on a mission from God as he killed 13 women and evaded police on nine separate occasions while committing the Yorkshire Ripper murders.

Described as the "perfect psychopath," Pedro Rodrigues Filho murdered at least 70 people — 47 of whom were fellow inmates in prison.

Mary Jane Kelly was an enigmatic figure with a mostly unverified story. What was clear, though, was the horrifying nature of her murder.

Though Robert Ben Rhoades is serving a life sentence for three murders, authorities believe that the Truck Stop Killer may have killed as many as 50 women while working as a trucker across America.

Mel Ignatow killed his girlfriend Brenda Sue Schaefer in 1988 and managed to get away with it. Two decades later, however, he met a grisly fate eerily reminiscent of that murder.