The 15 Biggest Mysteries in Human History That Remain Unsolved

Not every question history asks gets answered. Some events, disappearances, and ancient artifacts have resisted explanation for decades even centuries despite the best efforts of historians, scientists, and investigators. Here are 15 of the biggest mysteries that still remain unsolved.

1. The Lost Colony of Roanoke

In 1587, English settlers established a colony on Roanoke Island in present-day North Carolina. When a supply ship returned three years later, the colony was completely empty, with no signs of struggle only the word “CROATOAN” carved into a post. To this day, no one knows for certain what happened to the more than 100 settlers.

2. The Voynich Manuscript

Discovered in the early 20th century, this centuries-old handwritten book is filled with illustrations of unknown plants, strange diagrams, and text written in a language or code that has never been deciphered. Despite attempts by cryptographers, linguists, and even modern AI analysis, no one has definitively cracked its meaning.

3. Who Really Built Stonehenge and Why

Stonehenge’s massive stones were transported and arranged more than 4,000 years ago, some from quarries over 150 miles away. While researchers have theories involving ceremonial, astronomical, or burial purposes, there’s still no universally accepted answer for exactly how prehistoric builders moved the stones or precisely why the monument was built.

4. How the Easter Island Moai Were Moved

The giant stone statues on Easter Island, some weighing over 80 tons, were carved and transported across the island by a civilization with no modern machinery. Various theories including rocking the statues upright and “walking” them have been tested, but debate continues over the exact methods used and why the civilization that built them later collapsed.

5. The Oak Island Money Pit

For over two centuries, treasure hunters have dug into a mysterious pit on Oak Island in Nova Scotia, Canada, following clues suggesting hidden treasure, historical artifacts, or even lost documents. Several excavations have uncovered strange man-made structures underground, but no confirmed treasure has ever been found, and multiple people have died during search efforts.

6. Amelia Earhart’s Disappearance

In 1937, aviator Amelia Earhart vanished over the Pacific Ocean while attempting to fly around the world. Despite extensive searches at the time and numerous expeditions since, neither her plane nor definitive remains have ever been confirmed, and her fate remains one of the most debated mysteries in aviation history.

7. The Mary Celeste Ghost Ship

In 1872, the merchant ship Mary Celeste was found drifting in the Atlantic Ocean, fully seaworthy with cargo and provisions intact, but with no crew aboard. The captain, his family, and the entire crew were never found, and no confirmed explanation for their disappearance has ever emerged.

8. The Dyatlov Pass Incident

In 1959, nine experienced hikers died under mysterious circumstances in the Ural Mountains. Investigators found the group’s tent cut open from the inside and the hikers scattered outside, some without proper clothing for the freezing conditions. Theories range from avalanches to military testing, but no single explanation has been conclusively proven.

9. The D.B. Cooper Hijacking

In 1971, a man using the alias “D.B. Cooper” hijacked a commercial flight, extorted $200,000 in ransom, and parachuted out of the plane mid-flight, never to be seen again. Despite an extensive FBI investigation spanning decades, his true identity and fate remain unknown, making it the only unsolved commercial airline hijacking in U.S. history.

10. The True Identity of Jack the Ripper

In 1888, a series of brutal murders in London’s Whitechapel district were attributed to an unidentified killer nicknamed “Jack the Ripper.” Despite numerous suspects proposed over the decades including doctors, artists, and even members of high society, the killer’s true identity has never been definitively confirmed.

11. The Zodiac Killer’s Identity

Active in Northern California in the late 1960s, the Zodiac Killer taunted police and newspapers with encoded letters, some of which remained unsolved for decades. While one cipher was finally cracked in 2020, the killer’s actual identity has never been conclusively proven, despite numerous named suspects over the years.

12. The Tunguska Event

In 1908, a massive explosion flattened over 800 square miles of forest in a remote part of Siberia, with a force estimated at hundreds of times more powerful than the atomic bomb dropped on Hiroshima. No impact crater or meteorite fragments were ever found, leading to ongoing debate over whether the cause was a meteor, comet fragment, or something else entirely.

13. The Purpose of the Nazca Lines

Carved into the desert plains of Peru over 1,500 years ago, the Nazca Lines form massive geometric shapes and animal figures only fully visible from the air. Since the ancient Nazca people had no known means of flight, their purpose ranging from religious rituals to astronomical calendars remains a subject of ongoing debate among archaeologists.

14. The Origins of the Shroud of Turin

This centuries-old linen cloth bears the faint image of a man’s body and has been venerated by some as the burial shroud of Jesus Christ. Radiocarbon dating in the 1980s suggested a medieval origin, but questions about testing methods and sample contamination have kept the debate over its true age and origin alive among researchers.

15. The Antikythera Mechanism’s Full Capabilities

Recovered from a shipwreck off the coast of Greece in 1901, this ancient bronze device is believed to be an early mechanical analog computer, used to predict astronomical positions and eclipses over 2,000 years ago. While researchers have mapped much of its gear structure using modern imaging, questions remain about who built it, how such advanced technology existed at the time, and whether similar devices ever existed elsewhere.

Final Thought

Some mysteries fade with time. Others only grow stranger the closer we look. These 15 cases remind us that even with modern science, forensics, and technology, history still holds onto a few secrets it hasn’t given up.