The Half-Known

The Map of Ignorance

Every mystery, still unsolved

Every mystery published so far, newest first. Some are closer to an answer than others; none of them are closed.

  1. № 004127 SEPTEMBER 2026IDENTITYPILTDOWN, SUSSEX, ENGLAND

    The Hoax That Buried Its Own Maker

    In December 1912, a Sussex solicitor unveiled a skull that supposedly made England the missing link's birthplace. Scientists believed it for forty-one years, until 1953 chemistry exposed a filed orangutan jaw stained to match a human skull. A 2016 forensic study narrowed the suspects. It has never named one.

  2. № 004026 SEPTEMBER 2026SIGNALNEAR OSLO, NORWAY (FIRST REPORTED); LOGGED BY SHORTWAVE RECEIVERS WORLDWIDE SINCE

    The Radio Echo That Arrives Three Seconds Too Late

    In 1927, a Norwegian engineer heard a distant radio broadcast echo back three seconds late, when physics allows a seventh of a second. Ham radio operators worldwide have logged the same delayed echoes for a century. No instrument has ever caught one clean enough to prove what causes it.

  3. № 003925 SEPTEMBER 2026ARTIFACTMALVERN & WOLVERHAMPTON, ENGLAND

    The Cipher Too Short to Ever Be Proven Right

    In July 1897, composer Edward Elgar folded 87 hand-drawn symbols into a note to a 23-year-old friend and never explained one of them. A cash-prize competition and a 2023 cipher-cracking algorithm have both failed, and even a correct answer could never be checked against anything, because nothing else survives.

  4. № 003824 SEPTEMBER 2026PHENOMENONTAOS, NEW MEXICO, USA

    Two National Labs, One Town's Hum, No Source

    In the spring of 1991, Catanya Saltzman woke in her home outside Taos, New Mexico, to a droning hum with no apparent source. Two years later, Congress sent a federal team with instruments sensitive enough to catch sound below normal hearing. They found nothing — and nobody has since.

  5. № 003723 SEPTEMBER 2026DEATHKOWLOON TONG, HONG KONG

    175 Grams of Brain No One Can Explain

    Four weeks before Enter the Dragon made him a global star, Bruce Lee took a headache pill, lay down for a nap, and never woke up. The autopsy found his brain swollen by 175 grams. Fifty years and two competing 21st-century medical papers later, forensic pathologists still can't agree why.

  6. № 003622 SEPTEMBER 2026HEISTGHENT, BELGIUM

    Thirteen Letters and a Borrowed Photograph

    A note in French sat in the empty frame: taken from Germany by the Treaty of Versailles. Then came ransom letters signed D.U.A., and half the stolen plank returned as proof. By November 1934 the letters had stopped. Belgian investigators searched a villa for it in October 2024.

  7. № 003521 SEPTEMBER 2026PLACENAZCA PAMPA, ICA REGION, PERU

    The Woman Who Swept the Desert for Fifty Years

    Maria Reiche spent fifty years on a Peruvian desert with a household broom, sweeping dust off lines that had been scratched there two thousand years earlier. She measured as she swept. Her explanation for why the Nasca made them is the one the evidence has treated worst.

  8. № 003420 SEPTEMBER 2026DISAPPEARANCEEILEAN MÒR, FLANNAN ISLES, SCOTLAND

    The Rope Coils Were All Still Fastened

    On 26 December 1900 a relief keeper climbed to the Eilean Mòr lighthouse and found nobody there. Three men had walked out eleven days before. A hundred and ten feet above the Atlantic, the sea had torn a lifebuoy off its lashings without loosening a knot.

  9. № 003319 SEPTEMBER 2026IDENTITYPIGNEROL, SAINTE-MARGUERITE, AND THE BASTILLE

    The Prisoner Who Followed His Jailer's Career

    In July 1669 an officer collected a man at Calais and delivered him to a fortress in the Alps. For the next thirty-four years he moved between four prisons, always with the same jailer, never under his own name. He was buried in 1703 under a name nobody recognized.

  10. № 003218 SEPTEMBER 2026SIGNALNORTH PACIFIC OCEAN

    Fifty-Two Hertz, and No Animal Attached

    In 1989 a US Navy array built to listen for Soviet submarines picked up a tone at fifty-two hertz. William Watkins of Woods Hole tracked its source for twelve years across the North Pacific, eleven thousand kilometers in one season alone. Nobody has ever seen the animal.

  11. № 003117 SEPTEMBER 2026ARTIFACTBEDFORD COUNTY, VIRGINIA

    The Only Cipher Ever Broken Never Named the Spot

    In 1885, a Virginia pamphlet published two number sequences nobody has ever read and one describing a buried fortune without saying where. The Army's chief cryptanalyst and a modern algorithm have each tried the other two. A RAND researcher found something stranger in one. None has produced a readable word.

  12. № 003016 SEPTEMBER 2026DEATHGRINDER'S STAND, NATCHEZ TRACE, TENNESSEE

    The Only Witness Told It Three Ways

    Meriwether Lewis had crossed the continent and come back. Three years later he died of two gunshot wounds in a two-room inn on the Natchez Trace, and everything anyone knows about the hours before he was found comes from one woman who told it at least three different ways.

  13. № 002915 SEPTEMBER 2026HEISTDUBLIN CASTLE, IRELAND

    The Safe That Wouldn't Fit Through the Door

    A safe too wide for the strongroom door sat in the Office of Arms waiting room instead, holding the insignia of the Order of St Patrick. In July 1907, four days before the King reached Dublin, someone opened it with a key and put the empty cases back.

  14. № 002814 SEPTEMBER 2026PLACEELBERT COUNTY, GEORGIA

    The One Promise the Banker Never Broke

    In the summer of 1979, a stranger paid cash to build a 19-foot granite monument instructing humanity how to rebuild civilization after the next catastrophe — then swore the one man who knew his real name to permanent secrecy. In 2024, journalists think they found him. He never confirmed it.

  15. № 002713 SEPTEMBER 2026DISAPPEARANCENORTH ATLANTIC OCEAN, NEAR THE AZORES

    The Lifeboat Was Gone. Nothing Else Was.

    On 4 December 1872, a passing ship found the Mary Celeste sailing herself off the Azores — seaworthy, provisioned, her cargo untouched, and empty. The only lifeboat was gone. So were all ten people who'd sailed her out of New York a month before. None has ever been found.

  16. № 002612 SEPTEMBER 2026IDENTITYISDALEN, NEAR BERGEN, NORWAY

    The Body Built to Never Be Identified

    In November 1970, hikers found a woman's burned body in a Norwegian valley, Isdalen. Every label had been cut from her clothes, every mark filed off her belongings. She had checked into hotels under at least eight false names. A DNA profile and isotope study haven't said who she was.

  17. № 002511 SEPTEMBER 2026SIGNALCHICAGO, ILLINOIS

    The Mask Nobody Has Ever Matched to a Face

    On November 22, 1987, someone in a rubber Max Headroom mask cut into two live Chicago television broadcasts hours apart, first silently, then for almost a minute and a half with a taped skit. The FCC and FBI investigated for years. No one was ever charged.

  18. № 002410 SEPTEMBER 2026ARTIFACTPHAISTOS, CRETE

    241 Signs, One Object, No Second Copy

    In 1908 a Cretan foreman turned up a clay disc stamped, not carved, with 241 signs in a spiral — meaning someone first had to cut 45 reusable seals, centuries before movable type existed anywhere else. No one has ever found a second object in the same script.

  19. № 00239 SEPTEMBER 2026DEATHBALTIMORE, MARYLAND, USA

    The Clothes That Weren't His Own

    Ten days before his wedding, Edgar Allan Poe was found outside a Baltimore tavern, delirious, in clothes that weren't his. He never explained what happened to him. No autopsy was performed, no death certificate survives, and the one doctor who treated him told three different stories about it.

  20. № 00228 SEPTEMBER 2026HEISTJOHN F. KENNEDY INTERNATIONAL AIRPORT, NEW YORK, USA

    The Vault Had Three Times What They Came For

    Testimony from the men who were there says the crew walked into a JFK cargo vault expecting two million dollars. They found five or six. Nearly fifty years, one conviction, and a string of dead accomplices later, nobody has ever laid out where that money actually went.