Ancients get troops to cross a nearly 4,000 foot river, extract oil from the ground without the use of modern drilling technique and build a water tank which contained 3 million cubic feet of water.

Featuring first-person accounts by military eyewitnesses, government insiders and UFO experts, this special traces what a government investigation into 144 recent sightings can tell us about what these mysterious objects are and where they come from.

Mixed Martial Arts is the world's youngest and fastest growing martial art. Fusing devastating strikes and jabs with merciless chokes and joint locks, MMA incorporates elements of Muay Thai, Judo, wrestling, boxing and Jujitsu.

Humanoid robots are rapidly reaching a level of sophistication that was thought to exist only in science fiction. But is the obsession with creating counterfeit humans really pointing the way to mankind's future - or to its past?

The Abominable Snowman is among the most frightening monsters in history. The MonsterQuest team will undertake their most dangerous expedition to date with an epic ascent onto the snowy peaks where recent evidence of the beast was found.

Episode four centres on the Libation vessel. Exquisitely shaped from marble, it's Carl's favourite piece from the hoard and in pristine condition; adorned with four carved heads.

Ancients get troops to cross a nearly 4,000 foot river, extract oil from the ground without the use of modern drilling technique and build a water tank which contained 3 million cubic feet of water.

Featuring first-person accounts by military eyewitnesses, government insiders and UFO experts, this special traces what a government investigation into 144 recent sightings can tell us about what these mysterious objects are and where they come from.

Mixed Martial Arts is the world's youngest and fastest growing martial art. Fusing devastating strikes and jabs with merciless chokes and joint locks, MMA incorporates elements of Muay Thai, Judo, wrestling, boxing and Jujitsu.

Humanoid robots are rapidly reaching a level of sophistication that was thought to exist only in science fiction. But is the obsession with creating counterfeit humans really pointing the way to mankind's future - or to its past?

The Abominable Snowman is among the most frightening monsters in history. The MonsterQuest team will undertake their most dangerous expedition to date with an epic ascent onto the snowy peaks where recent evidence of the beast was found.

Episode four centres on the Libation vessel. Exquisitely shaped from marble, it's Carl's favourite piece from the hoard and in pristine condition; adorned with four carved heads.

Ancients get troops to cross a nearly 4,000 foot river, extract oil from the ground without the use of modern drilling technique and build a water tank which contained 3 million cubic feet of water.

Featuring first-person accounts by military eyewitnesses, government insiders and UFO experts, this special traces what a government investigation into 144 recent sightings can tell us about what these mysterious objects are and where they come from.

Mixed Martial Arts is the world's youngest and fastest growing martial art. Fusing devastating strikes and jabs with merciless chokes and joint locks, MMA incorporates elements of Muay Thai, Judo, wrestling, boxing and Jujitsu.

Humanoid robots are rapidly reaching a level of sophistication that was thought to exist only in science fiction. But is the obsession with creating counterfeit humans really pointing the way to mankind's future - or to its past?

The Abominable Snowman is among the most frightening monsters in history. The MonsterQuest team will undertake their most dangerous expedition to date with an epic ascent onto the snowy peaks where recent evidence of the beast was found.

Episode four centres on the Libation vessel. Exquisitely shaped from marble, it's Carl's favourite piece from the hoard and in pristine condition; adorned with four carved heads.

Experts believe that a crater in the Arizona desert and a giant nickel mine in Canada are the result of meteor strikes. Can these impacts help uncover Earth's geological history?

Where Did It Come From? travels to Mexico's Yucatan peninsula to get a first hand look at the ancient world's most skilled astronomers: the Maya.

Rick and Beau tackle the mighty River Ouse in Yorkshire, hunting for evidence of Britain's most notorious sea-faring raiders - the Vikings. With a find potentially dating to the 11th Century battle, it's a river hunt of epic proportions.

A new investigation into the true fate of the Knights Templar is launched. Did the order really fall in 1307? Or did the powerful Knights continue on in secret? The team begins their investigation in Jerusalem, the epicentre of the Templar's power.

On June 22, 1941, Germany launched Operation Barbarossa, a savage and merciless attack on the Soviet Union. Now, newly colorised film and amateur home movies provide an unprecedented inside look at this brutal conflict.

America has a history of building the impossible. Across the nation, a new generation of impressive projects is underway. On this episode: New Tappan Zee Bridge, Los Angeles Subway, New Orleans pump station, and Mount Rushmore preservation.

Lue Elizondo previously identified five observable characteristics of UFOs, dubbed the 'five observables'. But there is a so-called sixth observable Elizondo began to investigate - an invisible threat these craft may pose.

It turns base metal into gold and is the key ingredient in an elixir of eternal life. Sought since the 8th century BC, does the Sorcerer's Stone really exist?

Experts believe that a crater in the Arizona desert and a giant nickel mine in Canada are the result of meteor strikes. Can these impacts help uncover Earth's geological history?