After Muslim armies conquered the Iberian Peninsula in the eighth century, European forces began a campaign to retake the territory, which would ultimately last about 770 years.

The doomed Terra Nova Expedition led to the torturous deaths of British Captain Robert Falcon Scott and four of his crew members — after they failed to become the first explorers to reach the South Pole.

Nicholas Godejohn met Gypsy Rose Blanchard on a Christian dating site. Soon after their first few meetings in person, she asked him to murder her overbearing mother Dee Dee — and he said yes.

On February 2, 2014, movie star Philip Seymour Hoffman was found dead in his New York City apartment with a syringe in his left arm. He was just 46 years old.

Go inside the tragic life and death of Amy Winehouse, the iconic British singer-songwriter whose emotional lyrics and powerful singing made her a household name.

Colombian drug kingpin Pablo Escobar illegally imported four hippopotamuses for his private zoo in the 1980s, but they escaped after his death in 1993 — and now more than 150 of these "cocaine hippos" are running wild in the country's waterways.

In the early morning hours of August 5, 1962, Marilyn Monroe was found dead inside her Los Angeles home of an apparent drug overdose — but suspicions of foul play have persisted ever since.

Ismael "El Mayo" Zambada García took over the Sinaloa Cartel after Joaquín Guzmán's arrest in 2014. But unlike his predecessor, El Mayo remains at large despite a $15 million bounty for his capture.

Doreen Lioy was a successful woman who worked as an editor of Tiger Beat — until she married one of the worst serial killers in American history.

On August 11, 2014, Robin Williams died by suicide in Paradise Cay, California. An autopsy later showed that he had Lewy body dementia — a debilitating brain disease.

On May 11, 1981, reggae icon Bob Marley died due to a rare form of skin cancer that had gone tragically untreated for years.