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."

Dubbed the "Mexican Madonna" and the "Queen Of Tejano Music," Selena Quintanilla was a budding superstar — until she was gunned down in March 1995.

From the fortress that inspired Mary Shelley's "Frankenstein" to the palace that once housed the real Dracula, these are history's most haunted castles.

A literally heartless insect known as the "murder hornet" that can sting you repeatedly and land you in the hospital? It's not a nightmare — it's the Asian Giant Hornet.

On January 30, 1972, 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.

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.

From the crew's last days of training to the moment the Space Shuttle Challenger exploded, see one of the worst disasters in American aerospace history as it happened.