Researchers have identified a subtle optical illusion responsible for the painting's enigmatic smile.
An English archaeologist believes that Queen Nefertiti may lie in a secret room in Tutankhamun's tomb.
The German government has lost the right to keep its research on the UFO phenomenon from the public.
A secretive set of photographs has emerged showing two unidentified objects near a US Navy submarine.
The map studied by Columbus before his trans-Atlantic voyage has been cleaned up using computer software.
The CIA has pulled the plug on a project designed to investigate climate-related security threats.
Scotland Yard once believed that Star Trek fanatics had the potential to go mad and turn against society.
Lake Baikal in Siberia has been home to a spate of peculiar sightings and strange tales in recent years.
Built near the end of World War II, the hideout was intended to act as a refuge for escaping Nazis.
The bleeding edge bomber remains shrouded in secrecy and its costs may be spiraling out of control.
Several top secret documents relating to the D-Day landings have been found hidden inside a hotel.
A bag filled with items brought back from the Apollo 11 mission has been found in Neil Armstrong's house.
The mysterious patterns were once believed to be secret codes designed to guide German bombers.
An underground World War II complex used to develop nuclear weapons has been unearthed in Austria.
The CIA has revealed that its secret spy plane program was responsible for countless UFO sightings.
Speculation is rife over the purpose of a secretive Russian spacecraft currently orbiting the planet.
Felix Baumgartner's record breaking jump has been beaten in secret by Google executive Alan Eustace.
The secretive aircraft will be landing in California after being on a mission that lasted two years.
Long lost jewelery that belonged to the best-selling novelist has been found in a secret lockbox.
The infamous annual gathering of some of the world's most powerful people will take place on Thursday.