Unsolved Report

Ethiopia's Aksum stelae include a 33-meter, ~520-ton monolith—the largest single stone humans ever tried to raise. Here are the facts and the open mystery.

Ten ancient artifacts unexplained by archaeologists: the documented facts, the genuine open mysteries, and the leading theories, clearly labeled as speculation.

From the Antikythera Mechanism to Gobekli Tepe, explore 15 ancient mysteries that remain unexplained. Real archaeological cases, documented facts, open questions.

The Antikythera mechanism is a 2,000-year-old geared bronze "computer" from a Greek shipwreck. Here are the documented facts, the open mystery, and the leading theories.

A Harvard student tripped on a tree root and found Ban Chiang. The site's bronze age dating still divides archaeologists by a full millennium. Here's why.

Bujang Valley (Lembah Bujang) in Kedah, Malaysia may be Southeast Asia's oldest civilization. Explore the documented facts, the dating debate, and why 90% stays buried.

Cahokia was a Mississippian metropolis bigger than medieval London, then it emptied out. Here are the documented facts, the open mystery, and the leading theories.

Carnac's 3,000+ standing stones in Brittany predate Stonehenge by over 1,000 years. Here are the documented facts, the open mystery, and the leading theories.

Did Carthage sacrifice infants at the Tophet, or was it an ordinary cemetery? Explore the documented facts, the open mystery, and the labeled theories.

Catalhoyuk had no streets. People walked the rooftops and entered homes by ladder. Here are the documented facts, the open mystery, and the leading theories.

The Classic Maya collapse saw great lowland cities like Tikal and Copán fall silent around 800-900 CE. Here are the documented facts, the open mystery, and the leading theories.

For 20 years, archaeologist Kathleen Martinez has searched Taposiris Magna for Cleopatra's tomb. Here are the documented facts, the open mystery, and the theories.

The Cochno Stone holds around 90 Neolithic cup-and-ring carvings near Clydebank, Scotland. Buried in 1965, briefly re-exposed in 2016 — and still unexplained.

Who was the Dancing Girl of Mohenjo-daro, and why was she cast in bronze 4,000 years ago? The documented facts, the open mystery, and the leading theories.

Derinkuyu is an ancient underground city in Cappadocia, Turkey, carved 85m deep. What we know, the open questions, and the myths about its builders.

Dhar Tichitt in Mauritania holds hundreds of ancient dry-stone settlements built after 2000 BC. Here are the documented facts, the open mysteries, and the theories.

Dong Duong was the largest Buddhist monastery of ancient Champa, founded in 875 CE at Indrapura. Explore the documented facts and the open mysteries of its rise and ruin.

Six tons of glowing amber, a gift between kings, then gone. The true story of the Amber Room, the WWII treasure that vanished in 1945 and was never found.

The Antikythera wreck gave us an ancient computer and bronze masterpieces. Divers say 7-9 statues may still be buried. What else lies unexcavated in the hold?

Mel Fisher found the Atocha's "mother lode" in 1985, yet the galleon's sterncastle—holding the richest cargo—has never been located. Here's the evidence and the open mystery.

The Awa Maru carried a U.S. safe-passage promise when a submarine sank it in 1945. Did 40 tons of gold and Peking Man go down with it? Facts vs. legend.

How Afghanistan's Bactrian gold from Tillya Tepe was excavated in 1978, hidden in a vault for decades, and survived war. Documented facts, the open mystery, and the theories.

In 1629 the Dutch ship Batavia wrecked off Australia, sparking a mutiny and massacre. Here are the documented facts, the salvaged silver, and the open mysteries that remain.

The Beale ciphers point to a buried Virginia fortune locked behind two codes nobody has cracked. Here are the documented facts, the open mystery, and the leading theories.

The Belitung shipwreck held 60,000 Tang treasures inside an Arabian dhow. Discover the documented facts, the open mysteries, and the theories behind it.

Blackbeard's flagship Queen Anne's Revenge was found off North Carolina in 1996. So where is the pirate's treasure? The evidence tells a sober story.

In 1983, robbers stole three tonnes of gold from Heathrow's Brink's-Mat warehouse. Most of the Brink's-Mat gold was never recovered. Here's what's documented and what remains a mystery.

In 1653, a king's tomb yielded ~300 golden bees. In 1831 they were stolen from a Paris library and melted down. Only two survive. Here's the documented story.

A scroll of beaten copper from Qumran lists tons of hidden gold and silver across 64 sites. Is the Copper Scroll a real treasure map or ancient legend?

In 1840, workmen on England's River Ribble unearthed the Cuerdale Hoard, the largest Viking silver stash in western Europe. Who buried 88 pounds of silver, and why?

Did gangster Dutch Schultz bury a multimillion-dollar strongbox in the Catskills before his 1935 murder? The documented facts, the open mystery, and the legends.

A faint 511 keV glow marks vast antimatter annihilation near the galactic center. Decades on, scientists still cannot agree what makes the positrons.

Asteroid 6478 Gault, a rocky main-belt body, sprouted two comet-like tails in 2019. Here are the documented facts and the open mystery of active asteroids.

The "axis of evil" is a puzzling alignment in the cosmic microwave background. Here are the documented facts, the open mystery, and the leading theories.

The Bootes Void is a 330-million-light-year region nearly empty of galaxies. Here is what the data actually shows and why it does not break cosmology.

A large patch of the cosmic microwave background is colder than it should be. Here is the real evidence, the supervoid explanation, and what stays unsolved.

The Sun's surface is about 10,000°F, yet its corona soars past 1.8 million°F. Why? Inside the coronal heating problem, one of astrophysics' great open questions.

The cosmic ray knee origin is one of astrophysics' enduring puzzles: a kink at ~3.7 PeV where the galaxy's particle accelerators seem to hit their limit.

The cosmological lithium problem: the Big Bang predicts three times more lithium-7 than old stars actually show. The documented facts, the open mystery, and the leading theories.

Cygnus X-3 hid a galaxy-class ultraluminous X-ray engine in plain sight for 50 years. Explore the documented facts, the open mystery, and the leading theories.

Al Naslaa, a sandstone boulder near Tayma, Saudi Arabia, is split by a gap so clean it looks laser-cut. Here are the documented facts and the real geology.

The Baghdad Battery debunked: what the famous Parthian-era jar really is, why archaeologists reject the ancient-electricity story, and the theories that remain.

Between 1945 and 1950, several people vanished near Vermont's Glastenbury Mountain. Here are the documented Bennington Triangle disappearances, the open mystery, and the theories.

Bir Hima rock art in Saudi Arabia preserves 7,000 years of carvings and ancient inscriptions. Here are the documented facts, the open mystery, and the theories.

The Cottingley fairies hoax saw two girls fool Sherlock Holmes's creator with paper cutouts. The documented facts, the lingering mystery, and the theories.

The "ancient Aztec" crystal skulls were debunked when electron microscopes found rotary-wheel marks and a synthetic abrasive that didn't exist until the 1890s.

In July 1518, hundreds of people in Strasbourg danced uncontrollably for weeks. Here are the documented facts, the genuine open mystery, and the leading theories.

In 1971 a man hijacked a Boeing 727, took 200000 dollars, and parachuted into the storm. The only unsolved skyjacking in US history, told from the record.

From the eerie Bloop sound to a slow-blinking light on the seafloor, explore 10 documented deep sea mysteries that scientists still cannot fully explain.

In 1964 the USNS Eltanin photographed an "antenna" on the deep seafloor near Cape Horn. The truth — a carnivorous sponge — is stranger than the legend.