For 35 years, 97 letters on a copper sculpture at CIA headquarters have defeated the world's best codebreakers. In November 2025 the answer was sold for $962,500 — to an anonymous buyer sworn to keep it secret. The mystery was sold. It was not solved.

On a December afternoon in 1945, five US Navy bombers took off from Florida on a routine training run. Six aircraft and 27 men never came back.

In Taos, Bristol, Windsor and dozens of other places, a low, relentless drone torments a small minority of residents — and decades of scientific investigation have never found a single source.

In 1963 a glowing sphere drifted down an airliner's aisle, past a physicist. In 2012, spectrographs finally caught one in the wild — by accident. No one can yet say what it is.

Since 2007, more than twenty human feet in sneakers have washed ashore on one stretch of Pacific coastline. Science has explained how — but not every who, and not entirely why here.

Half of Minnesota's Brule River plunges into a hole in the rock and vanishes. For a century, everything thrown in disappeared without a trace — until two hydrologists tried the simplest test of all. One question, though, was never fully answered.

A fourteen-foot linen bears the ghostly image of a crucified man. Radiocarbon dating says the Middle Ages; a newer X-ray method says two thousand years. The science is still fighting.

January 1921: a five-masted schooner hard aground on Diamond Shoals, sails set, dinner mid-preparation — and eleven men gone without a trace. Five federal departments investigated. None could explain it.

In 1888 Louis Le Prince shot the first moving pictures in history - years before Edison or the Lumieres. Two years later he boarded a train from Dijon to Paris and vanished from it: no body, no luggage, no trace. Cinema's inventor became its own first unsolved mystery.

It began with three schoolgirls giggling in class. Within months, an unstoppable wave of laughing, crying and fainting had shut down schools across an entire region — and doctors could find nothing wrong.

Five children went missing in a Christmas Eve house fire in 1945 — yet the ashes held no remains, and 23 years later a photograph arrived in the mail.

In 1966, two Brazilian technicians were found dead on a hill near Rio de Janeiro, wearing suits, raincoats and lead masks over their eyes — beside a note about capsules and a signal that never came.