Archaeologists have been left perplexed by the sheer size of the shoes and why there are quite so many of them.
Even today, exactly what happened near Roswell, New Mexico almost eight decades ago remains a mystery.
The highly popular AI chatbot seems to be having an unexpected, adverse effect on a few people.
The phenomenon had left researchers perplexed - and its origin was the last thing they had ever expected.
The unusual chunk of ice was spotted during a fishing excursion off the coast of Labrador, Canada.
The event, which has taken place almost every year since 1954, remains shrouded in mystery and intrigue.
A skull found by farmers almost 70 years ago is at the center of an ongoing paleoanthropological mystery.
Local authorities are struggling to explain the sudden and anomalous increase in whale deaths.
The question of what happened to Richard III's nephews has long remained a topic of debate among historians.
For decades, these unusual recurring surface features have prompted speculation that there could be liquid water on Mars.
The 22-year-old, who hails from Australia, is suffering from a mystery ailment that doctors have been unable to explain.
Exactly what happened to the 118 colonists who settled on Roanoke Island in the late 1500s has long remained a mystery.
A quiet stretch of road in a remote part of Argentina has become synonymous with sightings of strange objects in the sky.
Researchers have been using underwater cameras to capture footage inside the wreck of the USS Yorktown.
A village nestled in the Turkish hills is home to an ongoing mystery that scientists are struggling to explain.
New video footage allegedly shows a peculiar aerial phenomenon that appeared recently over Canada.
The whereabouts of half the ordinary matter in the universe has long proven something of an enigma.
A short video clip shows a series of large footprints indicating a stride much greater than that of any human.
Scientists believe that they may have cracked the mystery of what caused the death of the young pharoah.
An unidentified animal that was captured on camera has left local residents and wildlife officials searching for answers.