Before Marilyn Monroe, there was Norma Jeane Mortenson: a curly-haired brunette who never imagined she would be more than a housewife.

Supposedly a powerful ancient demon, Zozo torments those who contact it through Ouija boards. But is this malevolent force from the spirit world or from our own minds?

Gary Michael Heidnik kidnapped, raped, and tortured six women starting in 1986, keeping them prisoner in the basement of his Philadelphia home.

After John du Pont started a training facility for wrestlers on his Foxcatcher estate in Pennsylvania, he grew close with former Olympian Dave Schultz — then he murdered him.

For eight straight months starting in September 1940, German planes bombed British cities in a relentless campaign known as the Blitz — but the people of Britain kept calm and carried on.

In 1965, Sylvia Likens and her sister Jenny were left in the care of family friend Gertrude Baniszewski — who tortured Likens to death and got her own children to help.

Starting in October 1977, Hillside Stranglers Kenneth Bianchi and Angelo Buono murdered 10 women and dumped their bodies in the hills surrounding Los Angeles.

On August 14, 1980, Playmate of the Year and budding actress Dorothy Stratten was gunned down by her estranged husband. She was just 20 years old.

These tragic photos and stories capture the horrors of the Nanking Massacre — a.k.a. the Rape of Nanking — committed by Japanese soldiers against Chinese civilians.

From 1961 to 1971, the U.S. used the herbicide and defoliant Agent Orange in Vietnam, leaving behind millions of victims with deadly diseases and birth defects.

Built between 9500 and 8000 BCE in present-day Turkey, Göbekli Tepe is a Neolithic place of worship that predates Stonehenge by over 6,000 years.