The Majestic Twelve: Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon? (S10, ep 8).

Great Sand Dunes National Park: A stroll through Great Sand Dunes National Park, where strange lights, animal mutilations and other bizarre incidents have been spotted. (S2, ep 9).

Cleveland National Forest: Explore Cleveland National Forest, where reports of gun-wielding ghosts, savage creatures and otherworldly portals are rife. (S2, ep 3).

Skunk Ape: Deep in the Everglades, Troy recruits an army of swampers to investigate reports of a possible beast - the Skunk Ape - probing his friend's home. (S2, ep 6).

Thirsty Work: The contestant's next challenge is to make drinking glasses and decanters in a combination of fashion and function. (S1, ep 5).

Pop Art Blowup: The remaining contestants must get creative to make colourful works of art out of everyday household items. (S1, ep 6).

The Alien Frequency: Different cultures have used mantras and chanting for thousands of years - could these in fact be a method of communing with extraterrestrial forces? (S10, ep 7).

The Majestic Twelve: Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon? (S10, ep 8).

Crater Lake National Park: This tourist hotspot is also rumoured to be the epicentre of dark and sinister forces from Native American lore that lure visitors to their deaths. (S2, ep 11).

Canyonlands National Park: A demonic truck driver, disembodied voices, nightmarish skinwalkers and a time loop are all reported to exist in Canyonlands National Park. (S2, ep 12).

A Family Secret: Armed with a mysterious map and unprecedented access to sacred Native American land, the Weibert family sets out to solve the mystery of Custer's lost gold. (S1, ep 1).

B24: The Liberator proved its worth in WWII over Europe and the Pacific, modeled after the B-17, delivering blows to the Axis. (S2, ep 4).

The Means to Victory: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (3 of 6).

The NASA Files: The team analyses incredible NASA footage of reported UFOs, and interviews former NASA employees who allegedly witnessed cover ups first hand. (S1, ep 10).

Precious Cargo: The astonishing accounts of four railway journeys that changed history, including the perilous expedition that made a young Winston Churchill world famous. (S1, ep 5).

Learn about the mystery of the vanishing lake, toxic hell storms, CIA-trained killer monks and polar bears that stalked stricken World War II heroes. (S5, ep 4).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 5).

Wernher Von Braun: Wernher von Braun was vital to NASA's Apollo 11 mission to put a man on the Moon, but this 'American hero' had his Nazi past kept under wraps. (S1, ep 2).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 8).

Unreal Estates: Immerse yourself in the jaw-dropping world of three crazy rich ancients who built some of the largest, most luxurious palaces ever known to man. (S1, ep 7).

Mega Mausoleums: These crazy rich ancients poured their money into building the most luxurious final resting places for themselves after death. (S1, ep 8).

The Alien Frequency: Different cultures have used mantras and chanting for thousands of years - could these in fact be a method of communing with extraterrestrial forces? (S10, ep 7).

The Majestic Twelve: Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon? (S10, ep 8).

Wernher Von Braun: Wernher von Braun was vital to NASA's Apollo 11 mission to put a man on the Moon, but this 'American hero' had his Nazi past kept under wraps. (S1, ep 2).

B24: The Liberator proved its worth in WWII over Europe and the Pacific, modeled after the B-17, delivering blows to the Axis. (S2, ep 4).

The Means to Victory: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (3 of 6).

The NASA Files: The team analyses incredible NASA footage of reported UFOs, and interviews former NASA employees who allegedly witnessed cover ups first hand. (S1, ep 10).

The Akashic Record: Experts question if Cloud computing represents the rediscovery of an ancient repository of knowledge known as the Akashic Record. (S10, ep 9).

Voices of the Gods: Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us? (S10, ep 10).

Crater Lake National Park: This tourist hotspot is also rumoured to be the epicentre of dark and sinister forces from Native American lore that lure visitors to their deaths. (S2, ep 11).

Canyonlands National Park: A demonic truck driver, disembodied voices, nightmarish skinwalkers and a time loop are all reported to exist in Canyonlands National Park. (S2, ep 12).

A Family Secret: Armed with a mysterious map and unprecedented access to sacred Native American land, the Weibert family sets out to solve the mystery of Custer's lost gold. (S1, ep 1).

Dual Intent: The contestants buddy up as they are challenged to make two-piece sculptures. (S1, ep 7).

The Glass Is Greener: The remaining contestants are challenged to work with scale, colour and texture to create masterfully crafted botanical-themed pieces. (S1, ep 8).

The Akashic Record: Experts question if Cloud computing represents the rediscovery of an ancient repository of knowledge known as the Akashic Record. (S10, ep 9).

Voices of the Gods: Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us? (S10, ep 10).

Join a voyage to Farne Islands, home to seals and seabirds, early Christian communities and one of the first landing sites for the terrifying Viking raiders. (1 of 4).

Writings on the Wall: In Montana, Penny and Craig close in on the priceless cache of weapons stripped from Custer's soldiers after the Battle of the Little Big Horn. (S1, ep 2).

Skyraider: The many variants of this single piston engine fighter bomber helped dominate the air to ground attack role in Vietnam, earning quite a reputation. (S2, ep 5).

The World at War: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (4 of 6).

Military vs. UFOs: The team examine incidents of alleged conflicts between the US Air Force and the RAF, and asking whether these encounters have been covered up. (S1, ep 11).

Secrets And Lies: Learn how Lawrence of Arabia used guerilla warfare against the Ottoman Empire's railways. Also, what secrets lie under New York's Grand Central Station? (S1, ep 6).

Explore the mystery of a sunken fleet in Maryland, weird Arctic holes that NASA cannot explain and strange structures in the desert close to Area 51. (S5, ep 5).

Unbreakable Codes: For centuries, mankind has devised ingenious ways to hide information, from enigmatic puzzles to secret symbols. Can we unlock these great mysteries? (S4, ep 7).

Strange Tales of WWII: Throughout history's largest and deadliest human conflict, a number of intriguing and persistent mysteries were born - from lost gold to secret societies. (S4, ep 8).

Ancient Warrior Sacrifice: In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored. (S3, ep 2).

Experts open previously off-limits files in a bid to answer some of the most mysterious questions surrounding UFOs and extra-terrestrial life. (S1, ep 6).

The Akashic Record: Experts question if Cloud computing represents the rediscovery of an ancient repository of knowledge known as the Akashic Record. (S10, ep 9).

Voices of the Gods: Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us? (S10, ep 10).

George III - More Than His Madness: George III, the first Georgian King born in Britain, faces the American Revolution and family scandals. (S1, ep 3).

Skyraider: The many variants of this single piston engine fighter bomber helped dominate the air to ground attack role in Vietnam, earning quite a reputation. (S2, ep 5).

The World at War: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (4 of 6).

Military vs. UFOs: The team examine incidents of alleged conflicts between the US Air Force and the RAF, and asking whether these encounters have been covered up. (S1, ep 11).

The Animal Agenda: Going by ancient cultures' depictions of gods appearing as animals, could it be that extraterrestrials bear more resemblance to animals than humans? (S10, ep 11).

The Replicants: While many believe in reincarnation, experts suggest that extraterrestrials designed the human body to be a vessel for otherworldly beings. (S10, ep 12).

Join a voyage to Farne Islands, home to seals and seabirds, early Christian communities and one of the first landing sites for the terrifying Viking raiders. (1 of 4).

Writings on the Wall: In Montana, Penny and Craig close in on the priceless cache of weapons stripped from Custer's soldiers after the Battle of the Little Big Horn. (S1, ep 2).

Body Parts: The glassblowers waltz into the world of dance as they are challenged to pinch, pluck and perfect molten glass into a sculpture that shows the body in movement. (S1, ep 9).

Best in Blow: It all comes down to this. As the two finalists go head to head in a final challenge gallery showing, only one can be named champion and pocket the $60,000 prize. (S1, ep 10).

The Animal Agenda: Going by ancient cultures' depictions of gods appearing as animals, could it be that extraterrestrials bear more resemblance to animals than humans? (S10, ep 11).

The Replicants: While many believe in reincarnation, experts suggest that extraterrestrials designed the human body to be a vessel for otherworldly beings. (S10, ep 12).

Starting on the Isle of Lewis in the Outer Hebrides, witness the 5,000-year-old standing stones of Callanish, traditional Scottish blackhouses, and cut peat with a modern crofter. (2 of 4).

The Last Stand: Guided by Native American legend, the team unearths a Custer-era bullet at the edge of the battlefield. If authentic, it could lead them to the secret cache. (S1, ep 3).

Huey: The definitive combat helicopter debuted in Southeast Asia, serving as transport, gunship, smoke ship, command center, MediVac and many other roles. (S2, ep 6).

By Night & By Day: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (5 of 6).

From ancient Egypt - when the Pharaohs ruled - to Anglo-Saxon England, uncover the origins of the curses surrounding the Bust of Nefertiti, the Staffordshire Hoard and more. (S1, ep 1).

First World War: A look into how the efficiency of the rail networks on both sides helped cause the stalemate of the First World War. (S1, ep 7).

Learn about the hunting of Jack the Ripper from space, the battle of the big guns in the land of the Bible, the clash of the mega-beasts, and a visitation from another galaxy. (S5, ep 6).

Maya, Khonkho Wankane, Xiongnu: Could new evidence found at the sacrificial alter, El Castillo, shed light on the Maya? And what can science tell us about ancient chemists? (S1, ep 6).

The Viking Burial Ships of Estonia: Venture to Estonia, where the earliest known Vikings ships to have crossed the Baltic - as well as mass ship burials - have been uncovered. (S1, ep 3).

Armed And Defenseless: Discover the fate of mankind's machinery of war in a world with no people, in which Pearl Harbor comes under renewed attacks, and snow causes urban avalanches.

Campus Haunting, Touched by a Demon: When a family move to an old house on a hospital campus, each member experiences the inexplicable. Events escalate until they must flee. (S1, ep 8).

The Animal Agenda: Going by ancient cultures' depictions of gods appearing as animals, could it be that extraterrestrials bear more resemblance to animals than humans? (S10, ep 11).

The Replicants: While many believe in reincarnation, experts suggest that extraterrestrials designed the human body to be a vessel for otherworldly beings. (S10, ep 12).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 8).

Huey: The definitive combat helicopter debuted in Southeast Asia, serving as transport, gunship, smoke ship, command center, MediVac and many other roles. (S2, ep 6).

By Night & By Day: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (5 of 6).

From ancient Egypt - when the Pharaohs ruled - to Anglo-Saxon England, uncover the origins of the curses surrounding the Bust of Nefertiti, the Staffordshire Hoard and more. (S1, ep 1).

A Spaceship Made of Stone: The Ishi-no-Hoden megalith in Japan was supposedly built to depict an ancient flying ship. Could this have been an ancient alien vessel? (S10, ep 13).

Alien Discs: Hundreds of seemingly alien discs are found in China, only to be taken by the Chinese government and dismissed as a hoax. Is there more to the story? (S10, ep 14).

Starting on the Isle of Lewis in the Outer Hebrides, witness the 5,000-year-old standing stones of Callanish, traditional Scottish blackhouses, and cut peat with a modern crofter. (2 of 4).

The Last Stand: Guided by Native American legend, the team unearths a Custer-era bullet at the edge of the battlefield. If authentic, it could lead them to the secret cache. (S1, ep 3).

Mirror, Mirror: The competitors look to mirrors for inspiration as they take a moment to reflect before creating pieces that represent how they see themselves. (S2, ep 1).

Think Inside the Box: In the tricky mystery box challenge, the competitors are tasked with creating different household items. (S2, ep 2).

A Spaceship Made of Stone: The Ishi-no-Hoden megalith in Japan was supposedly built to depict an ancient flying ship. Could this have been an ancient alien vessel? (S10, ep 13).

Alien Discs: Hundreds of seemingly alien discs are found in China, only to be taken by the Chinese government and dismissed as a hoax. Is there more to the story? (S10, ep 14).

Set sail for Rathlin Island as we explore a Neolithic stone tool factory, a unique upside-down lighthouse and a World War II shipwreck. (3 of 4).

Angkor Wat: The story behind the breath-taking temple complex, which is located in Cambodia and is the largest religious monument in the world.

Avenger: Explore classic and underrated aircraft, from WWII fighters to the Screaming Eagles F4, showcasing aviation's evolving history. (S3, ep 1).

Terror of the World: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (6 of 6).

From medieval Britain to the Northwest Passage in the Arctic, uncover the origins of the curses surrounding the Stone of Destiny, Landseer's Man Proposes, God Disposes and more. (S1, ep 2).

Second World War: Homefront: Eyewitness accounts of how trains were able to bring back troops from Dunkirk, and evacuate hundreds of children to safety. (S1, ep 8).

Explore a shipwreck found in the middle of the desert, learn about the German aerial terror of WW1 and traverse through a ghost town still stalked by a serial killer. (S5, ep 7).

SS Clare Lilley: For decades, residents in Nova Scotia have reported munitions washing up on their shores - believed to have come from the wreck of the SS Clare Lilley. (S1, ep 4).

Cougars and Fantasists: Meet the women who took Hitler under their wing, training him in the methods of high society and power - only to be left behind once he achieved it. (S1, ep 3).

Glory And Guts: True stories from WWII. Reporter Robert Sherrod accompanies Marines on their assault of Iwo Jima and witnesses the horror of the fight and the iconic flag raising. (8 of 10).

Exporting Cuba's Revolution: After the Cuban revolution, Fidel Castro looked to exert his influence in Venezuela. Is Cuba still in charge of Venezuela's future? (S2, ep 8).

A Spaceship Made of Stone: The Ishi-no-Hoden megalith in Japan was supposedly built to depict an ancient flying ship. Could this have been an ancient alien vessel? (S10, ep 13).

Alien Discs: Hundreds of seemingly alien discs are found in China, only to be taken by the Chinese government and dismissed as a hoax. Is there more to the story? (S10, ep 14).

The Gods of War: The industrial revolution changed it all when it came to cannons as they evolved from wholly inaccurate and immobile to deadly killing machines. (3 of 3).

Avenger: Explore classic and underrated aircraft, from WWII fighters to the Screaming Eagles F4, showcasing aviation's evolving history. (S3, ep 1).

Terror of the World: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (6 of 6).

From medieval Britain to the Northwest Passage in the Arctic, uncover the origins of the curses surrounding the Stone of Destiny, Landseer's Man Proposes, God Disposes and more. (S1, ep 2).

The Druid Connection: Experts examine strange stone structures on New England and New York's landscapes. Could they be clues of alien visitors to Earth? (S12, ep 7).

The Reptillian Agenda: Serpent gods are found in many religious texts. Could these stories be describing reptile-like extraterrestrials? And are they still here today? (S12, ep 8).

The Alien Infection: Is our planet prepared for an extraterrestrial invasion of disease? And could past plagues have been brought to Earth by aliens? Experts investigate. (S12, ep 9).

Inventions and Discoveries: Explore the groundbreaking discoveries, inventions and inventors throughout history that have changed the way we live our lives. (S1, ep 1).

Ghost Towns: Drones reveal what is left of Henry Ford's suburb in the Amazon, while clues to what killed a once-vibrant Pennsylvania mining town is discovered. (S1, ep 7).

The Druid Connection: Experts examine strange stone structures on New England and New York's landscapes. Could they be clues of alien visitors to Earth? (S12, ep 7).

The Reptillian Agenda: Serpent gods are found in many religious texts. Could these stories be describing reptile-like extraterrestrials? And are they still here today? (S12, ep 8).

Experts open previously off-limits files in a bid to answer some of the most mysterious questions surrounding UFOs and extra-terrestrial life. (S1, ep 6).

Glory And Guts: True stories from WWII. Reporter Robert Sherrod accompanies Marines on their assault of Iwo Jima and witnesses the horror of the fight and the iconic flag raising. (8 of 10).

Abandon All Hope Diamond: A diamond with a sinister past, the bones of a world-famous bard and a beach covered in cursed stones - who dares to disturb their peace? (S1, ep 2).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 5).

Experts open previously off-limits files in a bid to answer some of the most mysterious questions surrounding UFOs and extra-terrestrial life. (S1, ep 6).

Ancient Warrior Sacrifice: In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored. (S3, ep 2).

Abandon All Hope Diamond: A diamond with a sinister past, the bones of a world-famous bard and a beach covered in cursed stones - who dares to disturb their peace? (S1, ep 2).

The Lost Standard, the Steam Gun and the Sacrificial Throne: Investigate an intriguing 3,500-year-old box, a steam-powered gun and a monument that may have been an Aztec throne. (S2, ep 8).

Where's the Anchor: In rough water, salvors scramble to retrieve a cruise ship's anchor lost at sea - but they have to find it first. (S1, ep 7).

Shipwrecked Sailors of the Roman Empire: Kevin Sempé dives in search of wrecks harking back to the Roman Empire. The journey begins with the Nave Romana. (S2, ep 1).

Romeo & Juliet: When Samantha Lopez and Ronald McIntosh develop a romantic connection, they hatch an ambitious escape plan that utilises Ron's experience as a helicopter pilot. (S1, ep 1).

The Druid Connection: Experts examine strange stone structures on New England and New York's landscapes. Could they be clues of alien visitors to Earth? (S12, ep 7).

The Reptillian Agenda: Serpent gods are found in many religious texts. Could these stories be describing reptile-like extraterrestrials? And are they still here today? (S12, ep 8).

The Alien Infection: Is our planet prepared for an extraterrestrial invasion of disease? And could past plagues have been brought to Earth by aliens? Experts investigate. (S12, ep 9).

Cougars and Fantasists: Meet the women who took Hitler under their wing, training him in the methods of high society and power - only to be left behind once he achieved it. (S1, ep 3).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 5).

Ancient Warrior Sacrifice: In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored. (S3, ep 2).

Project Hybrid: Experts explore animal mutilations and alien abductions as they ask whether extraterrestrials could be altering human DNA. (S12, ep 10).

The Trans-Dimensionals: Could ghosts and angels be visitors from other-worldly realms? A team of ancient alien theorists explores. (S12, ep 11).

Islands of Fire: Could Hawaii's islands have once been inhabited by extraterrestrials? Experts investigate whether its volcanoes provide a portal between space and time. (S12, ep 12).

Entertainment: Examine the influence that popular culture and entertainment have on daily life. As we gravitate to larger-than-life stories, outlandish myths begin to spread. (S1, ep 2).

Desert Mysteries: Look down over a constant inferno in Turkmenistan, mysterious circles in the Namibian desert and secret electric blue ponds in Utah. (S1, ep 8).

Project Hybrid: Experts explore animal mutilations and alien abductions as they ask whether extraterrestrials could be altering human DNA. (S12, ep 10).

The Trans-Dimensionals: Could ghosts and angels be visitors from other-worldly realms? A team of ancient alien theorists explores. (S12, ep 11).

Maya, Khonkho Wankane, Xiongnu: Could new evidence found at the sacrificial alter, El Castillo, shed light on the Maya? And what can science tell us about ancient chemists? (S1, ep 6).

The Viking Burial Ships of Estonia: Venture to Estonia, where the earliest known Vikings ships to have crossed the Baltic - as well as mass ship burials - have been uncovered. (S1, ep 3).

Exporting Cuba's Revolution: After the Cuban revolution, Fidel Castro looked to exert his influence in Venezuela. Is Cuba still in charge of Venezuela's future? (S2, ep 8).

The Lost Standard, the Steam Gun and the Sacrificial Throne: Investigate an intriguing 3,500-year-old box, a steam-powered gun and a monument that may have been an Aztec throne. (S2, ep 8).

Maya, Khonkho Wankane, Xiongnu: Could new evidence found at the sacrificial alter, El Castillo, shed light on the Maya? And what can science tell us about ancient chemists? (S1, ep 6).

The Viking Burial Ships of Estonia: Venture to Estonia, where the earliest known Vikings ships to have crossed the Baltic - as well as mass ship burials - have been uncovered. (S1, ep 3).

Exporting Cuba's Revolution: After the Cuban revolution, Fidel Castro looked to exert his influence in Venezuela. Is Cuba still in charge of Venezuela's future? (S2, ep 8).

Secret Alien Attack: Are governments secretly preparing for an alien attack? From death stars to satellites, experts explore the likelihood of an extra-terrestrial strike. (S1, ep 18).

Top Ten Secret Societies: Could elite groups of power players be plotting the fate of the world? Discover the plans and goals of the world's most secretive organisations. (S1, ep 19).

Fatima's Lost Prophecy: In 1917, three young shepherd children from Fatima, Portugal, claimed to be instruments of divine prophecy. Was there truth to their allegations? (S1, ep 5).

Timur's Tomb: A neglected warning inside a mighty conqueror's tomb heeds one of the deadliest invasions in human history. (S1, ep 3).

In 1977, Amazonian village locals have a frightening encounter when a UFO shoots beams of light at them. An Australian farmer sees a strange object descend from the sky in 1963. (S2, ep 4).

In 1968, airmen in North Dakota spot a huge UFO over one of the US' most high security Air Force bases. Papua New Guinea village locals report strange objects in the sky in 1959. (S2, ep 5).

Project Hybrid: Experts explore animal mutilations and alien abductions as they ask whether extraterrestrials could be altering human DNA. (S12, ep 10).

The Trans-Dimensionals: Could ghosts and angels be visitors from other-worldly realms? A team of ancient alien theorists explores. (S12, ep 11).

Islands of Fire: Could Hawaii's islands have once been inhabited by extraterrestrials? Experts investigate whether its volcanoes provide a portal between space and time. (S12, ep 12).

New. Special Ops and Saboteur: A look at some of the most famous missions in modern history. Special operations require skilful people, but elite technology plays a part too.

The Lost Standard, the Steam Gun and the Sacrificial Throne: Investigate an intriguing 3,500-year-old box, a steam-powered gun and a monument that may have been an Aztec throne. (S2, ep 8).

Romeo & Juliet: When Samantha Lopez and Ronald McIntosh develop a romantic connection, they hatch an ambitious escape plan that utilises Ron's experience as a helicopter pilot. (S1, ep 1).

Return of the Gobekli Tepe: Experts examine the megalithic complex of Gobekli Tepe, and ask if such an advanced structure could possibly have been built by humans alone. (S10, ep 15).

The UFO Conspiracy: Following a 2017 public disclosure of secret government UFO investigations, are we any closer to proving there has been a UFO conspiracy? (S11, ep 1).

Angkor Wat: The story behind the breath-taking temple complex, which is located in Cambodia and is the largest religious monument in the world.

Name That Toon: In this episode, each competitor is tasked with creating their very own original cartoon character made of glass. (S2, ep 3).

Force of Nature: In this episode, each competitor is tasked with creating a special piece inspired by the phenomenon of climate change. (S2, ep 4).

Return of the Gobekli Tepe: Experts examine the megalithic complex of Gobekli Tepe, and ask if such an advanced structure could possibly have been built by humans alone. (S10, ep 15).

The UFO Conspiracy: Following a 2017 public disclosure of secret government UFO investigations, are we any closer to proving there has been a UFO conspiracy? (S11, ep 1).

Hagia Sophia Of Istanbul: Built in 537, this is a walk-through the stunning place of worship located in Istanbul, Turkey.

Ju52: Explore classic and underrated aircraft, from WWII fighters to the Screaming Eagles F4, showcasing aviation's evolving history. (S3, ep 2).

Queensland's Tropical Coast: Delve into the incredible collection of UFO stories of first-hand witnesses, from flying saucers to strange encounters in sugar cane fields. (S1, ep 1).

From an Anglo-Saxon Burial ground to the caves of the Judean Desert and Siberia in the Ice Age, uncover the origins of the curses surrounding Sutton Hoo, Lyuba and more.

The race to develop the first atomic bomb was critical amid the struggle for WWII victory. Experts reveal new evidence behind Germany's top-secret development of nuclear weapons. (S1, ep 1).

Investigate an electric blue mountain and the gateway to hell, the railroad of death and the town-swallowing Texan abyss. (S5, ep 8).

Chi-Town Showdown: Ton and Allen face off against infamous auction hunter Chicago Charles as they bid on a Victorian-era burial casket and a hazard from the 1870s. (S2, ep 7).

Top Gun Ton: The guys head to a major auction, where lots include a RC Viper Fanjet aircraft, as well as a 1920s Gundlach Korona expedition camera. (S2, ep 8).

The Other Cleopatra: Cleopatra II's reign was a truly dramatic and grisly tale. She saw her dynasty torn apart by hatred - but also saved it from destruction. (S1, ep 2).

Win Every War. Germany: Al joins forces with German comedian Henning Wehn to delve deeper into the truth behind some World War II myths.

Chupacabra: In 1995, farm animals in Puerto Rico begin turning up dead, apparently drained of blood. Was this the work of the fabled Chupacabra.

Return of the Gobekli Tepe: Experts examine the megalithic complex of Gobekli Tepe, and ask if such an advanced structure could possibly have been built by humans alone. (S10, ep 15).

The UFO Conspiracy: Following a 2017 public disclosure of secret government UFO investigations, are we any closer to proving there has been a UFO conspiracy? (S11, ep 1).

Ju52: Explore classic and underrated aircraft, from WWII fighters to the Screaming Eagles F4, showcasing aviation's evolving history. (S3, ep 2).

Queensland's Tropical Coast: Delve into the incredible collection of UFO stories of first-hand witnesses, from flying saucers to strange encounters in sugar cane fields. (S1, ep 1).

From an Anglo-Saxon Burial ground to the caves of the Judean Desert and Siberia in the Ice Age, uncover the origins of the curses surrounding Sutton Hoo, Lyuba and more.

Da Vinci's Forbidden Codes: Researchers claim hidden messages can be found within the works of Leonardo da Vinci that may reveal an extraterrestrial influence. (S11, ep 2).

The Alien Protocols: In 2017, a strange, cigar-shaped object enters the solar system, causing some astronomers to suggest that it could be an extraterrestrial craft. (S11, ep 3).

Set sail for Rathlin Island as we explore a Neolithic stone tool factory, a unique upside-down lighthouse and a World War II shipwreck. (3 of 4).

Hagia Sophia Of Istanbul: Built in 537, this is a walk-through the stunning place of worship located in Istanbul, Turkey.

Centre of Attention: At the midway stage of the competition, each competitor is tasked with creating a glass art centrepiece fit for a dining room table. (S2, ep 5).

Scents & Sensibility: The stakes are raised as the final comes into view on the horizon. This episode sees the competitors design a perfume bottle with a sculpted stopper. (S2, ep 6).

Da Vinci's Forbidden Codes: Researchers claim hidden messages can be found within the works of Leonardo da Vinci that may reveal an extraterrestrial influence. (S11, ep 2).

The Alien Protocols: In 2017, a strange, cigar-shaped object enters the solar system, causing some astronomers to suggest that it could be an extraterrestrial craft. (S11, ep 3).

Venture to England's South Coast, as we dive with sharks, explore the battlements of Drake's Island, uncover the origins of Scouts, and discover fossils on the Isle of Wight. (4 of 4).

Le Louvre: A look at the world's largest art museum, located in Paris, France and the home of the Mona Lisa.

P47: Explore classic and underrated aircraft, from WWII fighters to the Screaming Eagles F4, showcasing aviation's evolving history. (S3, ep 3).

Tasmania, New Zealand and the Bass Strait: Investigating the disappearance of pilot Frederick Valentich, whose last transmission gives an account of what he experienced. (S1, ep 2).

From the time of the Knights Templar to pre-historic Spain, uncover the origins of the curses surrounding the Turin Shroud, the Cave of Altamira and more.

In the final months of WWII, how close were the Nazis and Japan to creating the nuclear explosion that would win the war? Experts and historians examine the evidence. (S1, ep 2).

Witness a prehistoric ghost in Ireland, a machine that can see back in time and a giant pentagram in the Canadian snow. (S5, ep 9).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 6).

Werner Heisenberg: As one of their most controversial scientists, Heisenberg was key in the Nazis' efforts to build an atomic bomb. How close was he to achieving his goal? (S1, ep 3).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 9).

Power Couples: Three of the most extravagant and expensive weddings in history are profiled. Lavish and luxurious was the only way to celebrate for these big spenders. (S1, ep 9).

Holy Rollers: Meet the ancients who bankrolled the construction of massive churches and temples in a desperate attempt to buy their way into heaven. (S1, ep 10).

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Da Vinci's Forbidden Codes: Researchers claim hidden messages can be found within the works of Leonardo da Vinci that may reveal an extraterrestrial influence. (S11, ep 2).

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The Alien Protocols: In 2017, a strange, cigar-shaped object enters the solar system, causing some astronomers to suggest that it could be an extraterrestrial craft. (S11, ep 3).

Werner Heisenberg: As one of their most controversial scientists, Heisenberg was key in the Nazis' efforts to build an atomic bomb. How close was he to achieving his goal? (S1, ep 3).

P47: Explore classic and underrated aircraft, from WWII fighters to the Screaming Eagles F4, showcasing aviation's evolving history. (S3, ep 3).

Tasmania, New Zealand and the Bass Strait: Investigating the disappearance of pilot Frederick Valentich, whose last transmission gives an account of what he experienced. (S1, ep 2).

From the time of the Knights Templar to pre-historic Spain, uncover the origins of the curses surrounding the Turin Shroud, the Cave of Altamira and more.

Earth's Black Holes: Theorists speculate about the existence of black holes on Earth, which may explain strange disappearances and other inexplicable phenomena. (S11, ep 4).

The Desert Codes: Researchers study giant ancient drawings found etched into the desert floor, which may be a part of an ancient alien code. (S11, ep 5).

Venture to England's South Coast, as we dive with sharks, explore the battlements of Drake's Island, uncover the origins of Scouts, and discover fossils on the Isle of Wight. (4 of 4).

Le Louvre: A look at the world's largest art museum, located in Paris, France and the home of the Mona Lisa.

Who's Got Game?: In this round, the competitors are tasked with creating a special piece that reflects the hurdles they have overcome in their respective pasts. (S2, ep 7).

Runway Walk: In this round, the competitors are challenged with creating an intricately crafted accessory for a high fashion look. (S2, ep 8).

Earth's Black Holes: Theorists speculate about the existence of black holes on Earth, which may explain strange disappearances and other inexplicable phenomena. (S11, ep 4).

The Desert Codes: Researchers study giant ancient drawings found etched into the desert floor, which may be a part of an ancient alien code. (S11, ep 5).

Beyond Nazca: Giorgio Tsoukalos draws on evidence from past series as he takes an in-depth look at the mystery of Southern Peru's Nasca Lines. (S1, ep 1).

Taj Mahal: A walk through the iconic mausoleum complex, located in India and commissioned in 1632 by the Mughal emperor Shah Jahan to house the remains of his beloved wife.

Yak3: Explore classic and underrated aircraft, from WWII fighters to the Screaming Eagles F4, showcasing aviation's evolving history. (S3, ep 4).

Queensland & Papua New Guinea: Travel to Queensland's farming country where rain-drenched crops meet the Great Barrier Reef. Is there a link between water and UFO activity? (S1, ep 3).

From rural Spain in the 1800s to Russia during World War II, uncover the origins of the curses surrounding Goya's Black Paintings, the Amber Room and more. (S1, ep 5).

The First Crusade: Hamilton White and Carl Cookson are back on the trail of some truly astonishing relics in season two. (1 of 5).

Learn about Nazis and cannibals in the Black Forest, Russia's tectonic terror weapon and Jungle guerrillas on the warpath. (S5, ep 10).

Monsters Among Us: Tales of monsters and beasts have always sparked both fascination and fear - but do these stories possess elements of truth? (S4, ep 9).

Secrets of the Immortals: William Shatner is back on the hunt to find answers to the unexplainable, this week turning his attention to immortals. (S3, ep 5).

Mysterious Mongol Massacre: Archaeologists in Russia find several mass graves, a World War II plane sits on a Canadian mountain and cosmic rays in Antarctica have stump experts. (S3, ep 3).

Experts open previously off-limits files in a bid to answer some of the most mysterious questions surrounding UFOs and extra-terrestrial life. (S1, ep 7).

Earth's Black Holes: Theorists speculate about the existence of black holes on Earth, which may explain strange disappearances and other inexplicable phenomena. (S11, ep 4).

The Desert Codes: Researchers study giant ancient drawings found etched into the desert floor, which may be a part of an ancient alien code. (S11, ep 5).

George IV: The Party King: House of Hanover's party prince George IV ruled for ten years, indulging in wine, women and a life of excess and decadence. (S1, ep 4).

Yak3: Explore classic and underrated aircraft, from WWII fighters to the Screaming Eagles F4, showcasing aviation's evolving history. (S3, ep 4).

Queensland & Papua New Guinea: Travel to Queensland's farming country where rain-drenched crops meet the Great Barrier Reef. Is there a link between water and UFO activity? (S1, ep 3).

From rural Spain in the 1800s to Russia during World War II, uncover the origins of the curses surrounding Goya's Black Paintings, the Amber Room and more. (S1, ep 5).

Area 52: Could Area 51's notoriety act as a cover up to much bigger, top-secret extraterrestrial experiments taking place at multiple locations? (S11, ep 6).

Island of the Giants: Oak Island treasure hunter Marty Lagina and Ancient Astronaut theorist Giorgio A. Tsoukalos explore the ancient ruins of Sardinia, Italy. (S11, ep 7).

Beyond Nazca: Giorgio Tsoukalos draws on evidence from past series as he takes an in-depth look at the mystery of Southern Peru's Nasca Lines. (S1, ep 1).

Taj Mahal: A walk through the iconic mausoleum complex, located in India and commissioned in 1632 by the Mughal emperor Shah Jahan to house the remains of his beloved wife.

Light My Fire: In this round, the competitors are put to the test as they are tasked with creating a sculpture that captures the heat, energy and emotion of fire. (S2, ep 9).

Finale: In a pulsating season finale, the two remaining competitors must fill a gallery space with a show-stopping installation. (S2, ep 10).

Area 52: Could Area 51's notoriety act as a cover up to much bigger, top-secret extraterrestrial experiments taking place at multiple locations? (S11, ep 6).

Island of the Giants: Oak Island treasure hunter Marty Lagina and Ancient Astronaut theorist Giorgio A. Tsoukalos explore the ancient ruins of Sardinia, Italy. (S11, ep 7).

The Monoliths: Giorgio Tsoukalos takes a closer look at the evidence as he asks whether Earth's stone monoliths were built with extra terrestrial help. (S1, ep 2).

The Holy Sepulchre of Jerusalem: Uncover the secrets of the Holy Sepulchre, the sacred Christian site built in the same spot as the death and resurrection of Jesus. (S3, ep 1).

Hurricane: Explore classic and underrated aircraft, from WWII fighters to the Screaming Eagles F4, showcasing aviation's evolving history. (S3, ep 5).

Melbourne & Regional Victoria: Explore Melbourne's long history of UFO sightings and hear incredible first-hand accounts from Victoria's locals of otherworldly encounters. (S1, ep 4).

From India at the time of the Mughal Empire to the Assyrian city of Nineveh, uncover the origins of the curses surrounding the Koh-i-Noor, the Neo-Assyrian Stele and more. (S1, ep 6).

Celtic Gold: Hamilton White and Carl Cookson are back on the trail of some truly astonishing relics in season two. (2 of 5).

Discover terrifying new images of a blob swallowing a city, spy ships attacking America, skydiving cannibal spiders and the radioactive killer fly factory. (S5, ep 11).

The Loch Ness Monster: Despite centuries of sightings, the most infamous deep-sea monster remains unidentified. Does the Loch Ness Monster exist and, if so, what could it be? (S4, ep 1).

Hell's Agents: Agents Jay Dobyns and Jenna Maguire go undercover to infiltrate the Hells Angels - but the dream of being a fully patched member pushes Jay to the edge. (S1, ep 1).

Roads To Nowhere: What is the fate of our cars, planes and roads? What part would armadillos play in a future without people? And how do abandoned oil refineries threaten major disaster.