In 2011, a mining operation in Canada revealed the immaculately preserved fossil of a nodosaur, from the bony plates on its back to the ferns in its stomach.

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.

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

On August 28, 1963, some 250,000 civil rights activists gathered in Washington, D.C. to demand racial equality during the March on Washington. Here are some of the most memorable photos from that day.

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.

From Ted Bundy to John Wayne Gacy, John E. Douglas has interviewed just about every serial killer in recent history. Here's how he learned what made them tick.

Garry Hoy died on July 9, 1993, after performing a "party trick" that involved throwing himself against the windows on the the 24th-floor of his office building.

A humanoid monster with fangs, antlers, and glowing eyes, the Algonquian Wendigo either devours its victims or possesses their spirit and body.

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.

The Godfather of the Guadalajara Cartel, Miguel Ángel Félix Gallardo spent 18 years growing his empire. But the brutal murder of an undercover DEA agent in 1985 who infiltrated his cartel would be his downfall.

Said to measure seven feet tall with massive wings and glowing red eyes, the Mothman is a cryptid who has allegedly been sighted across West Virginia since the mid-1960s.

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.