The ruins of Herculaneum were discovered by accident in the early 18th century, and in the decades since, archaeologists have uncovered charred scrolls, wooden ships, and impeccably preserved buildings within the ancient city.

The night before Mexican singer Chalino Sánchez was found dead, he was performing in Sinaloa when an audience member passed him a note mid-concert that visibly disturbed him.

Over the course of three days in August 2009, Angela Simpson callously tormented Terry Neely because she thought he was a police informant.

The kidnapping of one-year-old Charles Lindbergh Jr. in 1932 was dubbed the "crime of the century," and the overwhelming amount of circumstantial evidence pointed to Bruno Hauptmann as the culprit.

Dave Toschi investigated the Zodiac case for decades, while his eclectic style also inspired Hollywood detectives like Frank Bullitt and "Dirty Harry" Callahan.

On October 28, 2015, Sophia Koetsier vanished while walking to the bathroom at Murchison Falls National Park. Two days later, her belongings were found strewn along a riverbank — but nobody could determine exactly what happened to her.

Although rumors about Polybius and the strange effects the video game had on players have spread for decades, nobody has ever found an arcade machine or any other evidence that the game is real.

Michael Gargiulo brutally murdered at least three women, including one who was dating actor Ashton Kutcher, before he was eventually arrested in 2008.

Although prison officials insisted that Kenneth Trentadue had hanged himself, he had injuries inconsistent with suicide — and his family believes he was beaten to death by guards after being mistaken for an Oklahoma City bombing suspect.

Joshua Maddux's family spent seven years searching for him after the 18-year-old vanished in 2008. His body was stuck in the chimney of an empty house just a quarter-mile away.