The long-lived space probe has been sending back some unusual data and nobody can figure out why.
A picturesque lake perched high atop a mountain in Ontario, Canada has a mystery that has yet to be solved.
A meat packing plant worker recently captured footage of an unidentified object falling from the heavens.
The unorthodox primate is believed to be a cross between two other (distantly related) species.
Scientists have been left scratching their heads by this perplexing and disturbing phenomenon.
After a three-year hiatus, the iconic atom smasher is preparing to begin a new era of scientific discoveries.
The coffin was unexpectedly discovered in the bowels of the cathedral following the devastating fire.
Many fragile 19th-Century wax cylinders contain audio recordings that have, until now, been impossible to listen to.
NASA has announced its mystery reveal - the record-breaking detection of a star 12.9 billion light years away.
The space agency is expected to announce an intriguing new discovery made using the Hubble Space Telescope.
The findings bolster one particular explanation to one of the 20th-Century's most enduring mysteries.
It has been 25 years since a mass UFO sightings over Phoenix, Arizona captivated the world.
A jogger recently came across this indescribable creature and nobody seems to know what on Earth it is.
A road in the UK has become so warped that parts of it are now sitting at a 45-degree angle.
A tiny island off the north-west coast of Scotland was once the site of a deadly germ warfare experiment.
A witness who had been driving home in the early hours of Sunday morning encountered something very unusual.
The US tactical fighter jets were sent to intercept a suspicious object near Kauai's north shore.
The man had been walking outside when he was hit by a bullet that seemed to come out of nowhere.
A railway crossing in England has gained something of a haunted reputation over the years.
The mysterious object, which mirrored the pilot's movements, was captured on camera.