The Strangest Unsolved Mysteries Across the USA. You’ll Never Believe Florida’s

Every state keeps a case file it can’t close.

Decades of detectives, professors, and armchair sleuths have thrown everything at these cases and walked away shrugging.

These are the strangest unsolved mysteries in the U.S., and we saved Florida’s for last.

North Carolina

America’s oldest mystery starts with a single word carved into a post: CROATOAN.

In 1587, more than 100 English colonists settled on Roanoke Island. Their governor sailed home for supplies, got delayed by war, and returned three years later to find every last settler gone.

No bodies. No burned homes. Just that word on the post.

Archaeologists digging on Hatteras Island have turned up 16th-century English artifacts that suggest some colonists moved in with the Croatoan people.

Suggest is the strongest word anyone will use.

After 439 years, the Lost Colony is still lost.

Massachusetts

In the early hours of March 18, 1990, two men dressed as Boston police officers talked their way into the Isabella Stewart Gardner Museum.

They left 81 minutes later with 13 works of art, including a Vermeer and two Rembrandts.

The haul has been valued at half a billion dollars, the largest property theft in American history.

Thirty-six years later, not one piece has surfaced, and the museum still offers a $10 million reward.

The empty frames hang on the museum walls, waiting.

Ohio

Starting in 1977, residents of Circleville began finding poison-pen letters in their mailboxes.

The anonymous writer seemed to know everyone’s secrets: affairs, debts, grudges, all of it printed in blocky capital letters and mailed by the hundreds.

A school bus driver targeted by the letters later found a booby trap rigged to a loaded pistol along her route.

Her brother-in-law went to prison over the trap.

The letters kept coming while he sat in a cell without writing materials, and they didn’t stop until 1994. Nobody has ever proven who wrote them.

Vermont

On December 1, 1946, Bennington College sophomore Paula Welden told her roommate she was going for a hike on the Long Trail.

Several hikers saw her on the trail near Glastenbury Mountain, a young woman in a red jacket.

Then the trail went cold. No pack, no jacket, no trace, despite a search that pulled in investigators from three neighboring states and the FBI.

The bungled early search led Vermont to form the Vermont State Police the following year.

Welden was one of several people who vanished around Glastenbury between 1945 and 1950, a stretch writers now call the Bennington Triangle.

Louisiana

Between 1918 and 1919, an axe-wielding killer stalked New Orleans, attacking residents in their homes at night.

Then a letter arrived at the newspapers, supposedly from the killer himself.

It promised he would strike again at 12:15 a.m. on March 19, 1919, but would spare any home where a jazz band was playing.

That night, New Orleans threw itself a citywide jazz party. Dance halls overflowed, and families hired musicians into their living rooms.

Nobody died that night.

The Axeman was never caught, never named, and his killings stopped as suddenly as they started.

Georgia

In 1979, a well-dressed stranger calling himself R.C. Christian walked into a granite company in Elberton and ordered a monument.

The name was fake. He said so himself.

The result was the Georgia Guidestones, a 19-foot granite array engraved with instructions for rebuilding civilization, in eight languages.

Only two locals ever met Christian, and both took his identity to their graves.

On July 6, 2022, four years ago today, someone bombed the monument, and the state tore down the rest for safety that same day.

Who built it and who destroyed it are now twin mysteries. Neither has an answer.

Texas

Nine miles east of Marfa, a pull-off on Highway 90 fills up most clear nights with people staring at the desert.

They’re watching for the Marfa lights: glowing orbs that hover, split, and dart over Mitchell Flat.

A cowhand first reported them in 1883, wondering if he’d spotted Apache campfires.

Researchers who studied the lights concluded that many sightings were car headlights bent by layered desert air.

Many, they said. Not all.

The town built a viewing center and lets the desert keep its secret.

New Mexico

In the early 1990s, people around Taos started hearing a low rumble, like a diesel engine idling somewhere over the horizon.

Most of their neighbors heard nothing.

University researchers surveyed the town and found roughly 2% of residents could hear the sound, and their equipment couldn’t detect it at all.

Covering your ears doesn’t block the Taos Hum.

Thirty years of theories have blamed everything from gas lines to ear physiology, and none has stuck.

California

The Zodiac Killer murdered five people in Northern California in 1968 and 1969, then taunted the press with letters and ciphers signed with a crosshair symbol.

He claimed 37 victims.

Police have worked through thousands of suspects over the decades, and the case file stays open in the FBI’s San Francisco division.

Investigators now run the same genetic genealogy that unmasked the Golden State Killer.

The Golden State Killer got caught. The Zodiac, so far, hasn’t.

Washington

The day before Thanksgiving 1971, a man in a dark suit calling himself Dan Cooper hijacked a Northwest Orient flight out of Portland, collected $200,000 in ransom in Seattle, and ordered the plane back into the air.

Somewhere over southwest Washington, he jumped into a rainstorm with the cash strapped to his body.

He remains the only air pirate in American commercial aviation never brought to justice.

A boy digging on a Columbia River sandbar found $5,800 of the ransom in 1980, still bundled.

The FBI suspended its active investigation in 2016 after 45 years. The rest of the money, and the man, never turned up.

Florida

Florida's mystery didn't claim one victim. It claimed 14 men, then 13 more who went looking for them.

On December 5, 1945, five Navy torpedo bombers took off from Fort Lauderdale on a routine training run called Flight 19.

Over the Atlantic, the flight leader radioed that both his compasses had failed and that the ocean below looked wrong.

All five planes and their 14 airmen vanished. So did a rescue seaplane sent after them, along with its crew of 13.

Searchers combed more than 250,000 square miles of ocean for five days.

They found no wreckage, no rafts, not even an oil slick.