Sightings of unidentified lights north of Rio de Janeiro last week managed to spark quite a ruckus online.
Archaeologists have unearthed a mysterious 19th-Century tunnel hidden beneath a station in Denmark.
In direct contrast to their depiction in the Jurassic Park movies, velociraptors were not actually pack hunters.
Back in 1976, several reports of a large owl-like creature sparked a legend that continues to endure to this day.
A Cambridge University worker has photographed a large wildcat with 'big claws' in his garden.
Scientists have found a way to determine how old whale sharks are using the fallout from atomic bomb testing.
The Humboldt squid has evolved a novel solution to the problem of communicating in the depths of the ocean.
Silent footage filmed during the Second World War shows a site connected to Britain's Enigma codebreakers.
A remarkable new AI system has been designed that can read what someone is thinking and turn it into text.
New research has revealed that the Neanderthals were no stranger to catching and eating sea creatures.
A surprising number of people in countries all across the world believe that they have been abducted by aliens.
This week marks the 70th anniversary of an intriguing UFO event that took place in Farmington, New Mexico.
A curious ring of smoke floating high above Disneyland, California was picked up on camera earlier this month.
One of the smallest ever dinosaur fossils has been found remarkably well preserved in a chunk of amber.
One of the most hotly debated UFO cases in history still continues to intrigue some 23 years later.
The full unredacted letter, which was sent to Rep. Mark Walker, has now been released to the public.
Scientists may have finally determined what might be behind this mysterious, invisible form of matter.
The discovery of a large feline print in the Blue Mountains has reignited speculation of a mystery big cat.
This distinctive disc-shaped cloud formation was recently photographed by a worker in the Cascade Mountains.
A freak accident has resulted in the deaths of four rare mountain gorillas in Uganda's Mgahinga National Park.