On a December morning in 1948, a well-dressed man was found dead on an Australian beach. Every label had been cut from his clothes. For 74 years, nobody knew his name.

In 1970, a burned body was found in a valley near Bergen — with every label cut from her clothes and eight false names in her wake. Half a century later, no one knows who she was.

In February 1959, nine experienced Soviet hikers slashed open their tent from the inside and fled, half-dressed, into a night of lethal cold. More than sixty years later, science has an answer — but not everyone believes it.

A haunting elevator video, a body found in a rooftop water tank, and an official ruling of accidental drowning — yet the questions surrounding the Cecil Hotel have never gone away.

In December 1872, a merchant ship was found gliding across the Atlantic in good order — cargo intact, table set for daily life, and not a soul on board. Ten people had vanished without a trace.

He hijacked a Boeing 727, collected $200,000, and leapt from the aft stairs into a stormy November night. More than fifty years later, no one knows who he was.

Twelve years, four seabed hunts and 239 unresolved fates: the disappearance of Malaysia Airlines Flight 370 remains aviation's greatest mystery.

A serial killer taunted San Francisco with encrypted letters. Two of his four ciphers have been cracked — one took 51 years — yet his identity remains a blank.

In December 1900, a relief ship reached a remote Scottish lighthouse and found the door shut, the lamps ready — and all three keepers gone without a trace.

In 1977, a radio telescope in Ohio caught a powerful narrowband signal from deep space. It lasted 72 seconds, looked exactly like an interstellar broadcast should — and it has never been heard again.