In October of 1943, a U.S. Navy destroyer was supposedly turned invisible and teleported from Philadelphia to Norfolk. But did it really happen?

From 1969 to 1980, Colombian serial killer Pedro Lopez raped and murdered up to 300 children — and no one knows where he is today.

In February 2000, Katherine Knight stabbed John Charles Thomas Price to death and cooked his remains — then served them to his two children.

On the afternoon of July 26, 2009, Diane Schuler sped the wrong way on the Taconic State Parkway and crashed into another car, killing eight people.

A pioneering British explorer, George Mallory hoped to become the first man to reach the summit of Mount Everest — and we still don't know if he accomplished his goal.

From serial killers like Ted Bundy and Jeffrey Dahmer to the slayings of the Manson Family, these real crime scene photos capture history's grisliest murders.

Though he was executed in 1936 for the murder of Grace Budd, serial killer Albert Fish claimed he killed 100 victims and "had children in every state."

Despite mountains of evidence, the mystery of what happened to Roland T. Owen in Room 1046 of the Hotel President in Kansas City remains unsolved to this day.

On March 31, 1922, a mysterious killer murdered a German family of five — Andreas and Cäzilia Gruber, their daughter Viktoria Gabriel, Viktoria's children Cäzilia and Josef — and the family's maid Maria Baumgartner. To this day, the killer has never been identified.

Between 1978 and 1990, Andrei Chikatilo murdered at least 53 people and mutilated their bodies — all while slipping right through the authorities' fingers on multiple occasions.

In April 2014, two Dutch tourists named Kris Kremers and Lisanne Froon went hiking in Panama and never returned. Months later, officials found their bleached bones and disturbing pictures.