Some mysteries fade because people stop caring.
Others get stranger the longer they sit online.
A grainy video. A missing plane. A child no one could name for 65 years. A cipher that took half a century to crack. These are the kinds of cases that don’t stay neatly filed away in police archives. They spill into forums, Reddit threads, YouTube timelines, old message boards, and late-night searches that start with one question and end three hours later with ten more.
That’s what makes internet rabbit holes so addictive. You’re not just reading what happened. You’re watching thousands of strangers try to make sense of what still doesn’t add up.
Some of the mysteries below are officially unsolved. Some are contested. Some have partial answers that only make the remaining gaps feel more unsettling. But all of them have one thing in common: the internet never really let them go.
1. Elisa Lam and the elevator video
On January 31, 2013, a Canadian student named Elisa Lam was staying at the Cecil Hotel in downtown Los Angeles when she disappeared.
Three weeks later, guests began complaining about low water pressure and a strange taste in the tap water. Hotel staff found her body in one of the rooftop water tanks. Her death was ruled accidental drowning.
The case went global when police released elevator surveillance footage from the night she disappeared, showing her pressing multiple floor buttons, hiding in the elevator’s corners, and appearing to gesture at someone outside the frame.
The footage’s timestamp had been altered, which LAPD attributed to a technical issue. A Netflix documentary covered the case in 2021. The community on r/ElisaLam and r/UnresolvedMysteries has never fully moved on from the footage.
2. Malaysia Airlines Flight MH370
On March 8, 2014, Malaysia Airlines Flight MH370 departed Kuala Lumpur for Beijing with 239 people aboard and disappeared 38 minutes after takeoff. Radar data suggests the plane turned back, crossed the Malaysian peninsula, and flew south over the Indian Ocean for hours after losing contact.
Satellite data indicated it went down somewhere in the southern Indian Ocean, but the initial search produced nothing. Over the years, debris has washed ashore on islands in the western Indian Ocean, confirming the general area.
A renewed deep-sea search by Ocean Infinity in 2025 covered 7,571 square kilometers of seabed and found nothing. On March 8, 2026, Malaysian authorities told the families the search had produced no findings. The plane, the 239 people aboard, and the explanation for what happened are all still missing.
3. JonBenét Ramsey
Six-year-old JonBenét Ramsey was found murdered in the basement of her family’s home in Boulder, Colorado on December 26, 1996.
Her father found her body hours after her parents called police to report a kidnapping ransom note. The note is one of the most analyzed documents in true crime history: written on paper from a notepad in the house, asking for an amount almost exactly matching John Ramsey’s recent bonus, and unusually long at 2.5 pages.
A grand jury voted to indict both parents in 1999; the district attorney refused to sign it, citing insufficient evidence. Boulder police announced new DNA testing on dozens of items from the case in 2024 and 2025, using technology unavailable at the time.
As of 2026, nearly thirty years after her death, no one has been charged.
4. The Zodiac Killer
Between 1968 and 1969, a serial killer operating in Northern California confirmed at least five murders, sent taunting letters to Bay Area newspapers, and included ciphers he claimed contained his identity. He was never caught.
For 51 years, a 340-character cipher sent to the San Francisco Chronicle in November 1969 remained unsolved. In December 2020, a team of three amateur codebreakers led by software developer David Oranchak cracked it using a custom algorithm run across 650,000 variations of the ciphertext. The decoded message reads: “I hope you are having lots of fun in trying to catch me.”
The Zodiac’s identity remains unknown. His other ciphers have not been fully solved. The case has one of the most active investigation communities on the internet, with new suspect theories surfacing regularly across subreddits and dedicated forums.
5. D.B. Cooper
On November 24, 1971, a man using the name Dan Cooper bought a ticket on Northwest Orient Flight 305 from Portland to Seattle, passed a note claiming he had a bomb, extorted $200,000 in cash, had the plane refueled, and then jumped from the rear stairs somewhere over the Pacific Northwest at night. He was never found.
In 1980, a bundle of the ransom bills turned up on the bank of a Columbia River tributary. The money’s partial recovery explained something about where it had been without explaining what happened to the man who took it.
The FBI ran an active investigation for 45 years before suspending it in 2016. It remains the only unsolved case of air piracy in US commercial aviation history. r/dbcooper continues to run its own investigation, decades after the FBI stopped its official one.
6. The Somerton Man
On December 1, 1948, an unidentified man was found dead on Somerton Beach near Adelaide, Australia. His clothing labels had been removed. His fingerprints matched no records. He carried no identification. A hidden fob pocket in his trousers contained a small rolled-up piece of paper bearing the words “Tamam Shud,” Persian for “finished,” torn from a rare edition of the Rubaiyat of Omar Khayyam.
A copy of that same book was later found nearby, containing a phone number and what appeared to be a handwritten code that has never been deciphered. In 2022, University of Adelaide professor Derek Abbott, working with American genealogist Colleen Fitzpatrick, proposed identifying the man as Carl “Charles” Webb, an electrical engineer from Melbourne.
South Australia Police described the finding as cautiously optimistic but have not officially confirmed it. The cause of death was also never established.
7. The Dyatlov Pass incident
In January 1959, a group of nine experienced Soviet hikers set out into the northern Ural Mountains on a ski trek and didn’t return. Search parties found their tent in February, cut open from the inside.
The hikers had fled into subfreezing temperatures in their sleep clothes. Their bodies were recovered at intervals over the following weeks, some with catastrophic internal injuries but no external wounds, and one missing her tongue.
Soviet investigators closed the case, concluding that an “unknown compelling force” had caused the deaths. The case was partially declassified after the Soviet collapse and has built one of the most active mystery communities online. Russian authorities officially attributed the deaths to an avalanche in 2021, but the finding was contested by researchers who noted the tent’s undisturbed snow was inconsistent with that explanation. r/dyatlovpass is still running.
8. The Delphi murders
On February 13, 2017, two teenage girls, Abby Williams and Libby German, went for a hike near Delphi, Indiana and didn’t come home. Their bodies were found the following day.
Before she disappeared, Libby captured footage and audio of the man police believe killed them. Police released a grainy clip of a figure walking a trail bridge and an audio recording of a male voice saying “down the hill.” The case went cold for five years before Richard Allen, a local pharmacist, was arrested in 2022. He was convicted on all four counts in November 2024 and sentenced to 130 years. His attorneys filed an immediate appeal, arguing his confessions were made under coercive conditions in solitary confinement and that exculpatory evidence was withheld from the jury.
The online community that organized around this case is one of the most active in true crime, and it’s following the appeal in real time.
9. The Gilgo Beach murders
In December 2010, the remains of multiple women were discovered along Ocean Parkway near Gilgo Beach on Long Island. By the time investigators finished searching the area, they had found the remains of ten or eleven individuals, most of them women who had advertised escort services online.
The pattern suggested a single, organized killer. The case went cold for more than a decade, and Long Island Serial Killer became one of the most actively discussed cases on true crime forums throughout the 2010s.
In July 2023, Rex Heuermann, a New York City architect, was arrested and charged with three murders. Charges expanded through 2024 as prosecutors gathered new DNA evidence: a fourth murder in January, two more in June, and a seventh in December, bringing the total to seven charged killings spanning 1993 to 2011.
On April 8, 2026, Heuermann pleaded guilty to all seven murders. In the same court appearance, he admitted to an eighth killing — that of Karen Vergata — for which he was not formally charged as part of the plea agreement.
Several of the other victims found in the area remain unidentified, and whether Heuermann is responsible for all the deaths along Ocean Parkway — or only some of them — has not been established. Those questions, and the years of cold-case speculation that preceded the arrest, are what the community built around this case is still working through.
10. The Boy in the Box
In February 1957, a child’s body was found in a cardboard box in a wooded area of northeast Philadelphia. The boy was between four and six years old, had been beaten, and showed signs of malnourishment. No one reported him missing. Police distributed hundreds of thousands of flyers across the region and interviewed thousands of people. Nothing produced an identification.
For 65 years he was known only as America’s Unknown Child, and the case built one of the longest-running cold-case communities in true crime. In 2022, the Philadelphia Medical Examiner’s Office announced that genealogical DNA analysis had identified the boy as Joseph Augustus Zarelli, born 1953. His family connections were traced through DNA, but investigators have not publicly named living relatives or explained how he came to be in that field. His killer has never been identified. The murder remains open.
Final thoughts
Maybe that’s the real pull of these rabbit holes.
It’s not only the mystery itself. It’s the feeling that somewhere, buried under old footage, witness statements, archived forum posts, Reddit comments, court files, and half-forgotten local memories, there might still be one detail everyone missed.
Of course, most people scrolling through these cases won’t solve them. A late-night thread probably won’t find a missing plane or name a killer decades after the fact.
But unresolved mysteries do something strange to the mind. They keep us looking for patterns. They make us question official answers. They remind us how many lives can be changed by one missing piece of information.
And maybe that’s why people keep returning to them.
Not because every case has a neat ending waiting at the bottom of the page, but because the unanswered parts stay alive. They leave space for doubt, grief, obsession, hope, and that uncomfortable little thought that keeps every rabbit hole open:
What if someone, somewhere, still knows something?
