Mass UFO sightings from the last 50 years fuel a mystery in this documentary series featuring eyewitness accounts, expert interviews and new evidence.

Sightings is an American paranormal and news television series that originally aired from April 17, 1992 to August 1, 1997. The program began as a special titled The UFO Report: Sightings on October 18, 1991. The original Concept Creator and Supervising Producer of that hour special produced by Paramount for Fox TV was Linda Moulton Howe, an Emmy Award-winning TV producer and documentary filmmaker of TV specials about science and the environment. One of her Emmy award-winning broadcasts was A Strange Harvest, about the worldwide animal-mutilation mystery linked by law enforcement to extraterrestrial biological entities.

Most Haunted is a British paranormal mystery documentary reality television series. The series was first shown on 25 May, 2002 and ended on 21 July, 2010. Led by Yvette Fielding, the programme investigated purported paranormal activity in many locations in the United Kingdom, Republic of Ireland and other countries. It was produced by Antix Productions and broadcast on the satellite and cable channels Living TV, Livingit, and Channel One. In the United States it was broadcast on the Travel Channel. It is now on Pluto TV with new episodes.

Are we finally a step closer to understanding the great unknown and what it may – or may not – hold? Man has always been curious about what is really out there in the vastness of space, and UFO sightings have been reported for years. Now, with video footage of sightings, radar evidence and eyewitness accounts from around the world, UFOs: The Untold Stories (Tuesdays at 8pm from 13th November) provides an in-depth look at the fascinating and disturbing aspects of encounters with the unexplained.

Dive into the mysteries of some of NASA’s most curious missions and explore stories of engineering achievement and human endurance. Each episode offers first hand testimony from astronauts, NASA mission footage, plus beautifully rendered CGI to bring to life these voyages that reveal unexplained sightings that have dogged many of NASA’s most famous missions.

Reenactments of alien encounters.

Weird Travels is an American documentary paranormal television series that originally aired from 2001 to 2006 on the Travel Channel. Produced by Authentic Entertainment, the program features various paranormal subjects around the world, especially cryptozoological creatures and haunted locations around the world. The series is narrated by Don Wildman, who also hosts and narrates the History channel's documentary television series Cities of the Underworld and Travel Channel's Off Limits.

Scariest Places on Earth is an American paranormal documentary reality television series that originally aired from October 23, 2000 to October 29, 2006. The program was produced by Triage Entertainment for the Fox Family Channel, which is now ABC Family and owns the rights to the show. The show featured reported cases of the paranormal by sending an ordinary family to visit the location in a reality TV-style vigil.

Every episode explores two chilling stories of real-life paranormal encounters that intersect with revenge. Each story unfolds from the perspective of a main storyteller – a victim – who has been targeted by a mysterious paranormal entity or entities. What follows is a truly original and compelling approach: a mash-up of the true-crime procedural and terrifying ghost stories.

In Search of... is a TV series that was broadcast weekly from 1977 to 1982, devoted to mysterious phenomena. It was created after the success of three one-hour TV documentaries produced by creator Alan Landsburg: In Search of Ancient Astronauts in 1973, In Search of Ancient Mysteries and The Outer Space Connection, both in 1975. All three featured narration by Rod Serling, who was the initial choice to host the spin-off show. After Serling's death, Leonard Nimoy was selected to be the host.

The Believers is a documentary series exploring the research and understanding of paranormal phenomena. Follow Sandy Lakdar and Jonathan Dailler as they investigate across Europe in historically rich locations, seeking video and audio evidence of this complex and mysterious reality.

Ghost Hunters Academy is a paranormal reality television series that premiered on November 11, 2009, on the Syfy channel. The program is the third spin-off series based on Ghost Hunters. The show features TAPS members Steve Gonsalves and Dave Tango as they lead a group of prospective investigators on various ghost hunting cases at locations that are allegedly haunted, and which had been previously investigated by TAPS. The tagline of the show is: "Get schooled...in the paranormal."

UFO Files is an American television series that was produced from 2004 to 2007 for The History Channel. The program covers the phenomena of unidentified flying and submerged objects, close encounters with alleged extraterrestrial life, and alleged military and government cover-up conspiracies. In 2008, a following series called UFO Hunters premiered on the same channel.

The shocking eyewitness accounts of terrified people whose dream homes have become nightmares are brought to life in vivid, blood-curdling style on "My Haunted House". Told via gripping first person interviews and strikingly crafted re-enactments, each episode of this nerve-wracking new series tells two, compelling horror stories of people literally living in terror.

Authorities all over the world say UFOs are real, but what are they, and are they a threat? This series examines the best and latest evidence caught on camera.

Exploring haunted locations associated with infamous serial killers, Zak Bagans and the Ghost Adventures team – Aaron Goodwin, Jay Wasley and Billy Tolley – seek to document whether malicious energy has been left behind by sadistic killers and their evil acts.

Delve deep into a vast archive of over 70,000 UFO files gathered over nearly half a century in Hangar 1. MUFON, an independent organization dedicated to investigating UFOs, has compiled these archives looking for connections, clues, and evidence to find the truth about UFOs.

Fact or Faked: Paranormal Files is a paranormal investigation series produced by Base Productions that began airing July 15, 2010, on SyFy. The show follows a team of investigators, led by former FBI agent Ben Hansen, who review various photographs and viral videos of alleged paranormal activity. If a particular piece of evidence is deemed intriguing enough to warrant further investigation, they set out to recreate and explain the sighting. Beginning episode #207 in first-half of season two, the show began to feature a "You Decide" segment in the middle of the program where a video is shown of something strange and then asks the viewing audience if they think the footage is fact or faked. After a commercial break the truth behind the video is revealed.

In this gripping docuseries, legendary reporter George Knapp travels the globe to uncover new evidence about UFOs and investigate their presence on Earth.

Ignited by a bombshell story revealing the Pentagon had been tracking UFOs for years, the series examines the history of the phenomenon through cultural and political touchpoints, including testimony from eyewitnesses across the country.