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In the Mojave Desert, there is a structure built to bestow everlasting life, and according to the architect, its blueprint is from another world.

Accounts of creatures that can shapeshift from one form to another can be found throughout history. But are they real and do they have otherworldly origins.

The ex-wife and former friends of Colin Ireland cast new light on the psyche of the Southend serial killer who terrorised the London gay scene in 1993.

The Wooden Wonder: The fascinating story behind the stunning wooden aircraft, which undertook some of the most daring and iconic raids of WWII. (6 of.

The F15 Eagle immediately turned the tide of the first Gulf War to prove its greatness.

The mighty Flying Fortress takes to the air as we examine the background and development of one of WWII's most iconic bombers.

Vandalism strikes the Wildman shop, inspiring Avery to finish building his Manta Coyote car kit. Meanwhile, Mike plans an auction for his car collection.

The White House has consistently denied any knowledge of aliens, but is it in fact possible that extraterrestrials have been influencing presidents.

Do the reported discoveries of towering, human-like skeletons reveal that the world was once inhabited by giants.

On the 20th anniversary of his death, the family of Stephen Lawrence reflect on his tragic murder in 1993, as well as their lengthy fight for justice.

Specialized landing craft built to go where no other combat ship can reach and able to deliver tanks, jeeps, soldiers and supplies to the front lines.

The mighty Flying Fortress takes to the air as we examine the background and development of one of WWII's most iconic bombers.

The White House has consistently denied any knowledge of aliens, but is it in fact possible that extraterrestrials have been influencing presidents.

Do the reported discoveries of towering, human-like skeletons reveal that the world was once inhabited by giants.

Across the world, there are stories of treasures that have been lost for centuries. Could these ancient relics have been hidden by extraterrestrials.

Experts question what probes on Mars may have found over the past 40 years. Could NASA be hiding proof of life on the Red Planet from the public.

Throughout history, spiritual leaders known as shamans have healed, protected and advised. Could they really be in contact with extraterrestrial realms.

Could insects have descended from extraterrestrials? Experts investigate whether Earth's 10 quintillion critters could have dangerous links to aliens.

Theorists ask whether a currently unidentified species represented in our DNA could be a result of breeding between humans and aliens in the remote past.

A new and shocking theory could explain one of America's most famous unsolved crimes - the disappearance of aviator Charles Lindbergh's 20-month-old son.

Witnesses and terrorism experts revisit May 2013, when soldier Lee Rigby was murdered by two religious extremists near his barracks in Woolwich.

The World War II killings carried out by the Nazis on Alderney represent the worst mass murder in British history - yet no one has been brought to justice. (2 of.

Explore and tackle the great unsolved mysteries of our world. Generations from now, their obscured truths will provide fertile ground for myth-making.

The Battle of Actium: Fought on September 2, 31 BC, the battle of Actium was a decisive naval clash that pitted the forces of Octavian against the Romans.

The White House has consistently denied any knowledge of aliens, but is it in fact possible that extraterrestrials have been influencing presidents.