10 of History's Most Mysterious Disappearances

This curated selection was assembled by the truecrime.news editorial team as cases where a disappearance — of a person, an identity, or the truth itself — remains at the heart of the mystery. Each case has been chosen for its enduring unanswered questions, its grip on public imagination, and its significance in the history of true crime.

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1. D.B. Cooper Hijacking — America's Only Unsolved Skyjacking

In November 1971, a man using the alias D.B. Cooper hijacked a Northwest Orient flight, extorted $200,000 in ransom, and then parachuted from the plane somewhere over the Pacific Northwest — never to be seen again. Despite one of the longest and most expensive investigations in FBI history, his true identity has never been established. A small bundle of the ransom money surfaced in 1980, but Cooper himself remains a ghost. The case was officially suspended in 2016, leaving it the only unsolved airline hijacking in American history.

2. The Mostly Harmless Case — Identification of an Unknown Hiker

In July 2018, a man's body was found in a tent in Big Cypress National Preserve, Florida. He carried almost no identification, had walked thousands of miles along the Appalachian and Florida trails, and was known only by trail nicknames like "Mostly Harmless." Online sleuths, hikers, and investigators spent years attempting to identify him. The case captivated the internet and raised profound questions about chosen anonymity, mental health, and how thoroughly a person can erase themselves. He was eventually identified in 2021 as Vance Rodriguez of New York.

3. The Nicholas Barclay Case — Missing Teen and Impostor Fraud

Nicholas Barclay, a 13-year-old from San Antonio, Texas, vanished in 1994. Three years later, a young man appeared in Spain claiming to be Nicholas — and his own family accepted him. In reality, he was Frédéric Bourdin, a French serial impostor who had taken on the missing boy's identity. The case raises haunting questions: what happened to the real Nicholas Barclay? His fate has never been determined, and his disappearance remains officially unsolved to this day.

4. The Gabby Petito Case — Murder During Cross-Country Trip

In September 2021, 22-year-old Gabby Petito was reported missing after a cross-country van trip with her fiancé Brian Laundrie. Her disappearance became a massive media story. Her body was found in Wyoming's Bridger-Teton National Forest, ruled a homicide by strangulation. Brian Laundrie, the prime suspect, himself disappeared — sparking a nationwide manhunt. His remains were eventually found in a Florida nature reserve in October 2021. While Petito's case was ultimately solved, Laundrie's death closed the investigation without a trial or full accounting.

5. The Alissa Turney Case — Unsolved Arizona Disappearance

Alissa Turney was 17 years old when she disappeared from Phoenix, Arizona, in May 2001. Her stepfather, Michael Turney, was the last known person to see her. For nearly two decades, her case went cold despite her half-sister Sarah Turney's persistent public campaign for answers. Michael Turney was eventually arrested in 2020 on unrelated charges of possessing pipe bombs, and investigators continued to examine him in connection with Alissa's disappearance. As of the time of writing, her remains have never been found, and no one has been convicted of her murder.

6. The Chandra Levy Case — Washington Intern Murder Unsolved

Chandra Levy, a 24-year-old Washington D.C. intern, vanished in April 2001. Her disappearance triggered a political firestorm when her relationship with Congressman Gary Condit was revealed. Her skeletal remains were discovered in Rock Creek Park in 2002. A man named Ingmar Guandique was convicted in 2010, but his conviction was overturned in 2015 and charges were dropped in 2016. The case remains officially unsolved — a missing person case that became a murder case, and then an unsolved one all over again.

7. The Jennifer Pandos Case — Virginia Cold Case Disappearance

Jennifer Pandos was 15 years old when she disappeared from Williamsburg, Virginia, in February 1987. She was never found. Decades of investigation produced no confirmed answers, no body, and no charges. The case sits in the category of the most enduring family mysteries in American cold case history, with suspicion long hovering over family members but never resulting in prosecution. Jennifer's disappearance remains one of Virginia's most haunting unresolved cases.

8. The ARA San Juan — Argentine Submarine Sinking and Naval Negligence

In November 2017, the Argentine submarine ARA San Juan disappeared in the South Atlantic with 44 crew members aboard. The vessel sent distress signals indicating an electrical fire and water intrusion before contact was lost. An international search effort failed to locate the submarine for over a year. It was finally found in November 2018 on the ocean floor, more than 800 metres deep. Investigations pointed to serious naval negligence, cover-ups, and systemic failures in Argentina's military infrastructure. No one was ever held criminally accountable for the deaths.

9. The Paddy Moriarty Disappearance — Unsolved Outback Mystery

In December 1995, Paddy Moriarty — a well-liked Irish-born outback resident — vanished from the remote Northern Territory town of Larrimah, Australia, along with his dog. No body was ever found. A coronial inquest in 2019 concluded that Moriarty had been unlawfully killed, and pointed strong suspicion at a neighbour — but no charges were laid due to insufficient evidence. The case is a uniquely Australian mystery: vast, isolated, and seemingly impossible to resolve.

10. The Frank Olson Case — CIA Scientist's Mysterious Death

In November 1953, U.S. Army biochemist Frank Olson fell from a New York hotel window and died. For decades it was ruled a suicide. In 1975, it emerged that Olson had been secretly dosed with LSD by the CIA as part of the MKUltra mind-control program just days before his death. His family has long contended he was murdered to prevent him from revealing classified secrets. The case was reopened but never conclusively resolved. Frank Olson's death remains one of the most troubling unsolved mysteries at the intersection of government secrecy and individual fate.