A sword found in Lincolsnhire's River Witham in 1825 bears a peculiar inscription that nobody can read.
Researchers have finally identified what has been causing loud booming sounds across the state.
Scientists have found a genetic link between the indigenous peoples of Australia and South America.
Researchers have been investigating a 350-year-old UFO case that remains a mystery to this day.
More than 600 dogs have inexplicably jumped off the 50ft Overtoun Bridge in a rural part of Scotland.
A 508 million-year-old spiky sea creature was so strange that scientists decided to name it Hallucigenia.
An unexplained pair of hands has appeared in photographs taken by two separate cameras in Borneo.
Scientists have found what is causing billions of gallons of water to drain out within a matter of hours.
New research has revealed that the stone's inscription does not relate to the person buried beneath it.
Scientists have finally worked out the answer to a mystery that has endured for over a century.
Over half of the world's remaining saiga antelope population has dropped dead within the last few weeks.
New photographs have provided important new clues to help solve the riddle of the mystery bright spots.
Residents were left baffled after hearing a strange roaring sound over a wide area on Sunday night.
Scientists have used an MRI scanner to solve the mystery of knuckle cracking once and for all.
Infrared images of the dwarf planet have revealed that the bright spots seem to behave in different ways.
A small island on a remote Siberian lake is home to stone ruins that remain shrouded in mystery.
Authorities have been appealing for assistance after the man walked in to the Polish Embassy in London.
First picked up in 2001, these so-called 'fast radio bursts' are continuing to perplex scientists.
Scientists believe that the two mystery bright spots on Ceres could be water spewing in to space.
Dashcam footage showing a bright white and blue flash over the city of Stavropol has gone viral.