Ivan IV Vasilyevich rose to power in the 16th century to become the first tsar of Russia — and earned the nickname "Ivan the Terrible" along the way.

William James Sidis spoke 25 languages and had an IQ 100 points higher than Albert Einstein's, but the smartest man in the world just wanted to live his life in seclusion.

River Country mysteriously shut down in 2001 — and instead of demolishing the once beloved water park, Disney abandoned it, allowing it to rot in plain sight for nearly two decades.

The iconic movie Goodfellas chronicles the lives of real gangsters like Henry Hill, Billy Batts, Tommy DeSimone, and Jimmy Burke — but it only tells part of the story.

Throughout the 1980s and '90s, Gary Ridgway prowled Washington as the Green River Killer, hunting for vulnerable women to rape and murder until he was arrested in 2001.

Grigori Rasputin was a mystic and renegade monk who entranced the Romanovs — and ended up being assassinated in December 1916 for it.

In the early hours of September 30, 1888, Catherine Eddowes was found murdered in London's Mitre Square. Her body had been severely mutilated — and her left kidney had been removed.

Lina Medina was only five years old when a doctor discovered she was seven months pregnant. And on May 14, 1939, she gave birth to a healthy baby boy named Gerardo.

For 300 years, the causes of the Salem witch trials have been hotly debated. Some blame boredom and teenage angst while others blame a hallucinogenic fungus.

Chris Farley's death in December 1997 was caused by a "speedball" mix of cocaine and morphine — but his friends think there's more to his tragic story.

He performed animal sacrifices, filed his teeth into points, and rarely bathed — yet Pazuzu Algarad still had two fiancés who assisted him with multiple murders in his North Carolina "House of Horrors."