Details of UFO reports and investigations in Australia have been made available at the National Archives.
A commercial pilot has come forward to claim that his jet was buzzed by a UFO as it came in to land.
More than 50 people have camped at Russia's Lake Baikai to search for evidence of alien visitors.
Sightings of a disc-shaped object hovering over the Olympic stadium have been circulating the internet.
Sightings of unidentified flying objects hit close to an all time high in Canada last year.
Skywatchers are reporting strange unidentified flying objects that only show up using infrared.
A famous abduction case in Scotland in 1992 allegedly sparked a top secret investigation by the military.
According to the results of a new National Geographic survey, over 36% of Americans believe in UFOs.
A new National Geographic television series, 'Chasing UFOs', will explore the world's UFO hotspots.
Psychic Uri Geller believes that his island in the Firth of Forth has become a hotspot for UFOs.
Former MoD investigator Nick Pope has warned of potential UFO activity over London during the Olympics.
Authorities in several countries were alerted following sightings of a strange swirling object in the sky.
An 11-year-old boy managed to snap a photograph of a strange object while playing in his garden.
The details of a 1952 UFO sighting by an RAF fighter pilot have been revealed for the first time.
UFO watchers have reported a record number of recent UFO sightings over New Zealand's North Island.
Authorities are investigating a mysterious object that almost caused a mid-air collision last week.
A couple in Cambridge, Ontario photographed a strange object flying around cloud cover overhead.
A witness has described a silver disk-shaped object gliding across the skies over Dartmouth, Nova Scotia.
UFO spotters have found something unusual on a picture taken by the Solar and Heliospheric Observatory.
A UFO investigation team has claimed to have filmed 'Men in Black' on a hotel's security camera.