Aspiring screenwriter Rey Rivera was just 32 years old when he disappeared on May 16, 2006. About a week later, he was found dead under strange circumstances at Baltimore's historic Belvedere Hotel — and the mystery remains unsolved to this day.

The day after the Tiananmen Square massacre, a lone protestor starred down a column of Chinese tanks in Beijing. His identity remains unknown, but the world knows him as the "Tank Man."

In the decades after Selena Quintanilla's murder by Yolanda Saldívar in March 1995, fans of the "Queen of Tejano Music" still mourn one of the music industry's biggest losses.

On January 30, 1972, a.k.a. Bloody Sunday, British soldiers brutally killed 13 unarmed civilians who were participating in a civil rights march in the Northern Irish city of Derry.

Marilyn Monroe's mother Gladys Pearl Baker was a single woman living with paranoid schizophrenia when she gave birth to the future icon, and their relationship remained strained until Monroe's sudden death.

At least two people died trying to reach the infamous Into The Wild bus on Alaska's Stampede Trail after hiker Chris McCandless died there in 1992.

On July 13, 1954, Frida Kahlo died at 47 at her home in Mexico, but suspicious details have some convinced that her death was a covered-up suicide.

The golden-colored silk of the banana spider — the aptly named golden silk orb-weaver — is stronger than steel and tougher than Kevlar.

Dutch Christmas traditions have long included a blackface servant known as Zwarte Piet, but anti-racism activists are now calling for this to end.

On March 31, 1995, Selena Quintanilla was shot to death by Yolanda Saldívar. Here's what happened to Selena's killer — and where she is today.

Ivan Milat had a history of violence. By 13, local authorities had him on their radar. By 19, he was a convicted thief. It wouldn't be long before he became the "backpacker murderer."