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Scattered around the world are long-forgotten engineering marvels, decaying cities and empty factories that once stood on the cutting edge of design and construction. Revealing why these engineering triumphs were built and how they were left to crumble. (Repeat).

Inside stories of the most iconic military aircraft of the last 60 plus years. (Repeat).

Face the horrors of the Hürtgen Forest Battle. Risk everything as an American company attempts to conquer a village riddled with German defenses, only to discovera US soldier crawling through an enemy minefield to capture Nazi machine gun nests. (Repeat).

Scattered around the world are long-forgotten engineering marvels, decaying cities and empty factories that once stood on the cutting edge of design and construction. Revealing why these engineering triumphs were built and how they were left to crumble. (Repeat).

Inside stories of the most iconic military aircraft of the last 60 plus years. (Repeat).

Face the horrors of the Hürtgen Forest Battle. Risk everything as an American company attempts to conquer a village riddled with German defenses, only to discovera US soldier crawling through an enemy minefield to capture Nazi machine gun nests. (Repeat).

Examining the sites of ancient Greek oracles. (Repeat).

The premiere spotlights the engineers who designed and built Saturn V, the rocket that made JFK's dream to put a man on the moon a reality. (Repeat).

The premiere spotlights the engineers who designed and built Saturn V, the rocket that made JFK's dream to put a man on the moon a reality. (Repeat).

Scotland's Great Glen, the iron castles of Wales, and the legendary home of King Arthur. Across Great Britain, national treasures abound, from natural and man-made marvels to landmarks made famous by its heroes and legends. But which is the grandest? Which is the most beloved? Explore the wonders that put the great into the nation, all captured from breathtaking heights. Then discover the incredible stories behind these landmarks. (Repeat).

We head into BC to Alaska and back again, exploring Carcross desert, Tatshenshini-Alsek Provincial Park, and the eastern edge of Kluane National Park. (Repeat).

The final two competitors create an installation in a gallery space. One artist is awarded the top prize. (Repeat).

Featured: Isaac Brock's daring made him a hero during the early months of the War of 1812, but it may also have been his fatal flaw. (Repeat).

An inexplicable evil tormenting the young girls of Reverend Samuel Parris's household spreads through the Puritan community of Salem Village. Fearing the influence of the devil, the afflicted soon begin to make accusations of witchcraft. (Repeat).

The number of accused keeps growing, hinting at a greater conspiracy of witches. The examinations take place in a packed Salem meetinghouse, where suspects face harsh questioning and a mob of afflicted young women shout accusations of witchcraft. (Repeat).

We head into BC to Alaska and back again, exploring Carcross desert, Tatshenshini-Alsek Provincial Park, and the eastern edge of Kluane National Park. (Repeat).

Mike Davidson is aboard one of the biggest and strongest helicopters on Earth, on a heart-pounding quest to pull millions of pounds of timber from the forest, while huge repairs, heavy winds, and forest fires threaten to bring this mission to a halt. (Repeat).

Mike Davidson is on an incredible journey across Lithuania on big trains packed to the brim; rolling across Soviet-era tracks from the edge of Belarus to the Baltic Sea, as massive ships wait to collect their bounty and take it across the ocean. (Repeat).

Mike Davidson rides the rails on a mission to haul hefty cargo across Switzerland to the Netherlands. It's a freight run going through four countries, and the Alps, with critical repairs and tight timelines challenging the crews at every turn. (Repeat).

Scattered around the world are long-forgotten engineering marvels, decaying cities and empty factories that once stood on the cutting edge of design and construction. Revealing why these engineering triumphs were built and how they were left to crumble. (Repeat).

Inside stories of the most iconic military aircraft of the last 60 plus years. (Repeat).

Face the horrors of the Hürtgen Forest Battle. Risk everything as an American company attempts to conquer a village riddled with German defenses, only to discovera US soldier crawling through an enemy minefield to capture Nazi machine gun nests. (Repeat).

The 2015 crash of a Turbine Otter plane that left three dead is investigated. (Repeat).

Part 1 of 2. An examination of the ancient city of Angkor, which is located in what is now Cambodia, begins with the largest temple on Earth, Angkor Wat. (Repeat).

The search for a monoplane that crashed two miles from its destination proves difficult because of the location: Knik Arm, an inland waterway near Anchorage that has extreme tides and frigid water temperatures. (Repeat).

Scientists and digital imaging experts uncover ancient secrets of the city of Venice. Using cutting-edge scanning technology, they explore the canals and the depths of the lagoon where the enigmatic city stands. Next, they digitally deconstruct the city's most iconic landmarks using CGI to show how they were engineered by their builders. (Repeat).

A medical helicopter flies over rush hour traffic to collect a patient, the search is on for a lost elephant, engineers race to fix a chopper, and airline pilots fly to one of the world's most dangerous runways. (New).

A national snowstorm brings US aviation to a standstill, but Anchorage fights through the storm. USAF aircrews endure the toughest survival training on Alaska's North Slope, and a veteran aircraft flies life-saving cargo. (Repeat).

Scientists and digital imaging experts uncover ancient secrets of the city of Venice. Using cutting-edge scanning technology, they explore the canals and the depths of the lagoon where the enigmatic city stands. Next, they digitally deconstruct the city's most iconic landmarks using CGI to show how they were engineered by their builders. (Repeat).

A medical helicopter flies over rush hour traffic to collect a patient, the search is on for a lost elephant, engineers race to fix a chopper, and airline pilots fly to one of the world's most dangerous runways. (Repeat).

A national snowstorm brings US aviation to a standstill, but Anchorage fights through the storm. USAF aircrews endure the toughest survival training on Alaska's North Slope, and a veteran aircraft flies life-saving cargo. (Repeat).

Part 1 of 2. An examination of the ancient city of Angkor, which is located in what is now Cambodia, begins with the largest temple on Earth, Angkor Wat. (Repeat).

The search for a monoplane that crashed two miles from its destination proves difficult because of the location: Knik Arm, an inland waterway near Anchorage that has extreme tides and frigid water temperatures. (Repeat).

The 2015 crash of a Turbine Otter plane that left three dead is investigated. (Repeat).

Inside stories of the most iconic military aircraft of the last 60 plus years. (Repeat).

Spotlighting the city of Whitehorse; the Alaska Highway; the community of Haines Junction; and Kluane National Park. (Repeat).

Profiling Charles de Salaberry, whose cunning tactics defended Lower Canada from invasion in the War of 1812. (Repeat).

With her husband wounded, Laura Secord sets out on a long journey to warn the British of a possible American attack. (Repeat).

The Salem witch trials finally begin with the case against Bridget Bishop, who is quickly found guilty. However, her death is not enough to quell the hysteria. (Repeat).

The witch trials and executions are suddenly stopped when some elites of Massachusetts are also accused. (Repeat).

Spotlighting the city of Whitehorse; the Alaska Highway; the community of Haines Junction; and Kluane National Park. (Repeat).

Engineers, technicians, and laborers undertake a massive project at the Panama Canal Railway. Using heavy equipment, tools, and their skills and experience, they repair kilometers of tracks, machines, and other parts of the 47.6 miles of railway traversing Central America from the Pacific to the Atlantic Ocean. (Repeat).

Mike Davidson ventures into the deep waters of the Caribbean Sea, for high stakes repairs aboard refurbished military vessels that are now the heart and soul of one of the world's largest open-ocean fish farm operations. (Repeat).

Witness a multi-million-dollar tunnel boring project under Lake Ontario, one of the biggest freshwater lakes in the world. See it cut through rock to make a passageway for treated water. (Repeat).

Scientists and digital imaging experts uncover ancient secrets of the city of Venice. Using cutting-edge scanning technology, they explore the canals and the depths of the lagoon where the enigmatic city stands. Next, they digitally deconstruct the city's most iconic landmarks using CGI to show how they were engineered by their builders. (Repeat).

A medical helicopter flies over rush hour traffic to collect a patient, the search is on for a lost elephant, engineers race to fix a chopper, and airline pilots fly to one of the world's most dangerous runways. (Repeat).

A national snowstorm brings US aviation to a standstill, but Anchorage fights through the storm. USAF aircrews endure the toughest survival training on Alaska's North Slope, and a veteran aircraft flies life-saving cargo. (Repeat).

The search for a monoplane that crashed two miles from its destination proves difficult because of the location: Knik Arm, an inland waterway near Anchorage that has extreme tides and frigid water temperatures. (Repeat).

Conclusion. An examination of the ancient city of Angkor, which is located in what is now Cambodia. Included: the decline of the Khmer Empire; and why Angkor was abandoned. (Repeat).

The 2015 crash of a Cessna 150 at Big Lake is investigated. (Repeat).

A family of wing walkers puts their daughter's boyfriend to the test, a real-life superhero shows that we don't need a plane to fly, and a group of animal lovers race against time to fly stray dogs to new families on the mainland. (Repeat).

Mike Davidson rides the rails on a mission to haul hefty cargo across Switzerland to the Netherlands. It's a freight run going through four countries, and the Alps, with critical repairs and tight timelines challenging the crews at every turn. (Repeat).

A look at three gravity defying structures, from an alien port authority in Belgium to an ultrathin skyscraper in Manhattan to a "hanging" museum in Scotland. (Repeat).

A family of wing walkers puts their daughter's boyfriend to the test, a real-life superhero shows that we don't need a plane to fly, and a group of animal lovers race against time to fly stray dogs to new families on the mainland. (Repeat).

Mike Davidson rides the rails on a mission to haul hefty cargo across Switzerland to the Netherlands. It's a freight run going through four countries, and the Alps, with critical repairs and tight timelines challenging the crews at every turn. (Repeat).

A look at three gravity defying structures, from an alien port authority in Belgium to an ultrathin skyscraper in Manhattan to a "hanging" museum in Scotland. (Repeat).

Conclusion. An examination of the ancient city of Angkor, which is located in what is now Cambodia. Included: the decline of the Khmer Empire; and why Angkor was abandoned. (Repeat).

The 2015 crash of a Cessna 150 at Big Lake is investigated. (Repeat).

The search for a monoplane that crashed two miles from its destination proves difficult because of the location: Knik Arm, an inland waterway near Anchorage that has extreme tides and frigid water temperatures. (Repeat).

A medical helicopter flies over rush hour traffic to collect a patient, the search is on for a lost elephant, engineers race to fix a chopper, and airline pilots fly to one of the world's most dangerous runways. (Repeat).

More than a hundred concrete arrows across America; a giant oversized phallus figure made of chalk on a hillside in England; a hole in a Southern Californian lake. (Repeat).

Part the waters using satellite imagery to see what lies beneath. Discover a lost-lost Turkish basilica, a church spire amid toxic sludge in Romania, a ship hull in the North Sea, and a shocking underwater find that rivals the Great Barrier Reef. (Repeat).

Dig up artifacts virtually using stunning satellite imagery. See evidence of female power in ancient Kush, secrets long buried in a New Mexico pueblo, a shocking find near the amazing Nazca Lines in Peru, and new mysteries in Cambodia's Angkor Wat. (Repeat).

Zoom in on strange markings in northern Finland that turn history on its head. Then, go deep into a Vietnamese cave to discover a Manhattan-sized mystery, uncover 1.5 million secrets in Antarctica, and look inside a lost sky-high world in Mozambique. (Repeat).

The remains of Henry Ford's suburban dream in the Brazilian jungle are examined. (Repeat).

The Book of the Dead, which collects ancient Egyptian spells to help the deceased in the underworld, is examined. Included: whether the the book is hiding something deep about ancient Egyptian beliefs. (Repeat).

The engineers who built the Apollo Lunar Module, which allowed astronauts to land on the moon and then launch back into orbit. (Repeat).

A nine-part series exploring Great Britain's historic sites and elegant scenery by helicopter. (Repeat).

As our population and sophistication grow, so has the damage we've caused to the Earth. (Repeat).

Mike Davidson rides the rails on a mission to haul hefty cargo across Switzerland to the Netherlands. It's a freight run going through four countries, and the Alps, with critical repairs and tight timelines challenging the crews at every turn. (Repeat).

A look at three gravity defying structures, from an alien port authority in Belgium to an ultrathin skyscraper in Manhattan to a "hanging" museum in Scotland. (Repeat).

The engineers who built the Apollo Lunar Module, which allowed astronauts to land on the moon and then launch back into orbit. (Repeat).

The Book of the Dead, which collects ancient Egyptian spells to help the deceased in the underworld, is examined. Included: whether the the book is hiding something deep about ancient Egyptian beliefs. (Repeat).

The engineers who built the Apollo Lunar Module, which allowed astronauts to land on the moon and then launch back into orbit. (Repeat).

The inside scoop on six of the wealthiest people in history while revealing the secret of how they became crazy rich. (Repeat).

Audie Murphy uses a burning tank destroyer to fight off a German attack. (Repeat).

Engineers, technicians, and laborers undertake a massive project at the Panama Canal Railway. Using heavy equipment, tools, and their skills and experience, they repair kilometers of tracks, machines, and other parts of the 47.6 miles of railway traversing Central America from the Pacific to the Atlantic Ocean. (Repeat).

The inside scoop on six of the wealthiest people in history while revealing the secret of how they became crazy rich. (Repeat).

Audie Murphy uses a burning tank destroyer to fight off a German attack. (Repeat).

Engineers, technicians, and laborers undertake a massive project at the Panama Canal Railway. Using heavy equipment, tools, and their skills and experience, they repair kilometers of tracks, machines, and other parts of the 47.6 miles of railway traversing Central America from the Pacific to the Atlantic Ocean. (Repeat).

The Book of the Dead, which collects ancient Egyptian spells to help the deceased in the underworld, is examined. Included: whether the the book is hiding something deep about ancient Egyptian beliefs. (Repeat).

The engineers who built the Apollo Lunar Module, which allowed astronauts to land on the moon and then launch back into orbit. (Repeat).

The engineers who built the Apollo Lunar Module, which allowed astronauts to land on the moon and then launch back into orbit. (Repeat).

A nine-part series exploring Great Britain's historic sites and elegant scenery by helicopter. (Repeat).

A look at a crater in Turkmenistan and the circles carved into the Namib Desert. (Repeat).

Retrace the path of a famous aviation mystery and size up thousands of shipwrecks in the Bermuda Triangle of the north. Then, uncover a lost piece of South Pacific history and study a 10,000-year-old enigma in the murky depths of the Yucatan Peninsula. (Repeat).

The pyramids of Giza working as a map of the stars; Hurricane Katrina survivors find hope in the first responders; An Indonesian volcano turns blue; A look into America's forgotten pleasures. (Repeat).

Bizzare mammals are found in a river in Columbia; A ship is found marooned along the Skeleton Coast in Nambia; A Boeing 727 jetliner is found hiding in a forest; A strange pattern is found in a desert in Nevada. (Repeat).

A bizarre open ocean spiral is spotted in Australia; strange tracks are seen along the seabed. (Repeat).

A visit to Chaco Canyon in New Mexico, which was the center of the Pueblo civilization. (Repeat).

The story of the engineers who created the world's first reusable space vehicle. (Repeat).

Southeast of mainland Greece, a ring of over 200 islands dot the Aegean Sea: the Cyclades, which translates to "circular islands." According to Greek myth, they were made by the vengeful sea god Poseidon, but to residents and tourists, this large archipelago brings wonder and astonishing views. Soar above landscapes carved by human civilization and by elemental forces above and beneath the Earth. (Repeat).

The inside scoop on six of the wealthiest people in history while revealing the secret of how they became crazy rich. (Repeat).

Audie Murphy uses a burning tank destroyer to fight off a German attack. (Repeat).

Engineers, technicians, and laborers undertake a massive project at the Panama Canal Railway. Using heavy equipment, tools, and their skills and experience, they repair kilometers of tracks, machines, and other parts of the 47.6 miles of railway traversing Central America from the Pacific to the Atlantic Ocean. (Repeat).

The story of the engineers who created the world's first reusable space vehicle. (Repeat).

A visit to Chaco Canyon in New Mexico, which was the center of the Pueblo civilization. (Repeat).

The story of the engineers who created the world's first reusable space vehicle. (Repeat).

An exclusive tour of the CIA's private museum reveals some of the agency's most remarkable spycraft and the daring missions on which they were used. (Repeat).

The murder of Lizzie Borden's father and stepmother is revisited. New forensics and theories are used to uncover what happened. (Repeat).

Experience the awe-inspiring power of the Great Pyramid of Giza, the only one of the Seven Wonders of the Ancient World still standing. Get an unprecedented look inside its secret chambers and see what they reveal about this stone giant's origins. (Repeat).

An exclusive tour of the CIA's private museum reveals some of the agency's most remarkable spycraft and the daring missions on which they were used. (Repeat).

The murder of Lizzie Borden's father and stepmother is revisited. New forensics and theories are used to uncover what happened. (Repeat).

Experience the awe-inspiring power of the Great Pyramid of Giza, the only one of the Seven Wonders of the Ancient World still standing. Get an unprecedented look inside its secret chambers and see what they reveal about this stone giant's origins. (Repeat).

A visit to Chaco Canyon in New Mexico, which was the center of the Pueblo civilization. (Repeat).

The story of the engineers who created the world's first reusable space vehicle. (Repeat).

The story of the engineers who created the world's first reusable space vehicle. (Repeat).

Southeast of mainland Greece, a ring of over 200 islands dot the Aegean Sea: the Cyclades, which translates to "circular islands." According to Greek myth, they were made by the vengeful sea god Poseidon, but to residents and tourists, this large archipelago brings wonder and astonishing views. Soar above landscapes carved by human civilization and by elemental forces above and beneath the Earth. (Repeat).

Discover the truth behind the world's earliest legends. Visit a polar bear-infested island. Explore thestrange twin craters in Greece. Peek at asupervolcano hidden beneath Yellowstone Park. (Repeat).

Walk among colossal wonders scattered across the Earth's surface. Peek at a huge ancient reptile skeleton, a massive head carving in the Alberta badlands, a giant South African footprint, and a pentagram etched into a remote peninsula in Kazakhstan. (Repeat).

Try to find the origins of the planet's most puzzling structures. Traipse along ancient pathways crisscrossing Easter Island, find gigantic designs carved into Asia's Eastern Steppe, and ascend a tall pyramid rising from Antarctica's icy landscape. (Repeat).

Plummet into some of the most cavernous places on the planet. Explore an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica. (Repeat).

Discover patterns that can only be seen from the air. Marvel at a perfect circle carved around an ancient peak, view a scary phenomenon in the Pacific, see strange shapes in a Middle Eastern desert, and detect a formation below the ocean's surface. (Repeat).

Most experts believe King Arthur was simply a mythical figure. But exciting new evidence from Britain's ancient sacred sites suggests that the myths are founded in fact. (Repeat).

The engineers behind the International Space Station share their story. (Repeat).

From ancient battles to athletic spectacles to natural wonders, see southern Greece as you've never seen it before. (Repeat).

An exclusive tour of the CIA's private museum reveals some of the agency's most remarkable spycraft and the daring missions on which they were used. (Repeat).

The murder of Lizzie Borden's father and stepmother is revisited. New forensics and theories are used to uncover what happened. (Repeat).

Experience the awe-inspiring power of the Great Pyramid of Giza, the only one of the Seven Wonders of the Ancient World still standing. Get an unprecedented look inside its secret chambers and see what they reveal about this stone giant's origins. (Repeat).

The engineers behind the International Space Station share their story. (Repeat).

Most experts believe King Arthur was simply a mythical figure. But exciting new evidence from Britain's ancient sacred sites suggests that the myths are founded in fact. (Repeat).

The engineers behind the International Space Station share their story. (Repeat).

Take a trip to Rotterdam, Guangzhou, and London and witness astounding feats of design and engineering. (Repeat).

Soar over the most puzzling of all of Egypt's pyramids on a revolutionary drone flight. Dive into the open-air center of this building and decode its stages of construction, then learn how this engineering wonder has stood the test of time. (Repeat).

An epic find in South Dakota fuels suspicion and misfortune. Then, an Egyptian boy king's tomb may be plagued by an ancient curse. And a relic coveted by a king may have doomed his reign. (Repeat).

Take a trip to Rotterdam, Guangzhou, and London and witness astounding feats of design and engineering. (Repeat).

Soar over the most puzzling of all of Egypt's pyramids on a revolutionary drone flight. Dive into the open-air center of this building and decode its stages of construction, then learn how this engineering wonder has stood the test of time. (Repeat).

An epic find in South Dakota fuels suspicion and misfortune. Then, an Egyptian boy king's tomb may be plagued by an ancient curse. And a relic coveted by a king may have doomed his reign. (Repeat).

Most experts believe King Arthur was simply a mythical figure. But exciting new evidence from Britain's ancient sacred sites suggests that the myths are founded in fact. (Repeat).

The engineers behind the International Space Station share their story. (Repeat).

The engineers behind the International Space Station share their story. (Repeat).

From ancient battles to athletic spectacles to natural wonders, see southern Greece as you've never seen it before. (Repeat).

Dig up artifacts virtually using stunning satellite imagery. See evidence of female power in ancient Kush, secrets long buried in a New Mexico pueblo, a shocking find near the amazing Nazca Lines in Peru, and new mysteries in Cambodia's Angkor Wat. (Repeat).

Feudal Japan was in turmoil in 1551. A succession dispute inside the Shogunate has seen central government collapse, kick-starting a period of bloody civil war known as the Sengoku Jidai - 'the Age of the Warring States.' (Repeat).

With much of central Japan under his control, Nobunaga must now fight the powerful Buddhist armies that oppose his bid to rule the nation. (Repeat).

Nobunaga overcomes some of his biggest challenges in his effort to reunite Japan. Included: How he combats an army of fierce rebels and a plot launched from deep within his inner circle aimed at ending his reign forever. (Repeat).

Following the death of Oda Nobunaga, his most trusted general, Toyotomi Hideyoshi has seized power. However, he is not the only one with his eye on Japan's biggest prize. (Repeat).

The ancient Maya built many of their sacred sites to watch the sky, but new research suggests these places were also linked to underground cave systems. A recentscientific discovery unlocks a fascinating secret about the most famous Mayan temple. (Repeat).

The inside story of the Hubble Telescope and the team of engineers, scientists and astronauts who built it. (Repeat).

Take flight over Crete's ancient palaces, the jewels of the Dodecanese, and other stunning eastern islands of Greece. (Repeat).

Take a trip to Rotterdam, Guangzhou, and London and witness astounding feats of design and engineering. (Repeat).

Soar over the most puzzling of all of Egypt's pyramids on a revolutionary drone flight. Dive into the open-air center of this building and decode its stages of construction, then learn how this engineering wonder has stood the test of time. (Repeat).

An epic find in South Dakota fuels suspicion and misfortune. Then, an Egyptian boy king's tomb may be plagued by an ancient curse. And a relic coveted by a king may have doomed his reign. (Repeat).

The inside story of the Hubble Telescope and the team of engineers, scientists and astronauts who built it. (Repeat).

The ancient Maya built many of their sacred sites to watch the sky, but new research suggests these places were also linked to underground cave systems. A recentscientific discovery unlocks a fascinating secret about the most famous Mayan temple. (Repeat).

The inside story of the Hubble Telescope and the team of engineers, scientists and astronauts who built it. (Repeat).

Exploring ship graveyards, including Scapa Flow in Orkney, where German warships were scuttled after the First World War, and Mallows Bay, the home of 200 wrecks colonized by wildlife. (Repeat).

Dig up artifacts virtually using stunning satellite imagery. See evidence of female power in ancient Kush, secrets long buried in a New Mexico pueblo, a shocking find near the amazing Nazca Lines in Peru, and new mysteries in Cambodia's Angkor Wat. (Repeat).

The world's water resources are in crisis. What can we do to reverse the tide? (Repeat).

Exploring ship graveyards, including Scapa Flow in Orkney, where German warships were scuttled after the First World War, and Mallows Bay, the home of 200 wrecks colonized by wildlife. (Repeat).

Dig up artifacts virtually using stunning satellite imagery. See evidence of female power in ancient Kush, secrets long buried in a New Mexico pueblo, a shocking find near the amazing Nazca Lines in Peru, and new mysteries in Cambodia's Angkor Wat. (Repeat).

The world's water resources are in crisis. What can we do to reverse the tide? (Repeat).

The ancient Maya built many of their sacred sites to watch the sky, but new research suggests these places were also linked to underground cave systems. A recentscientific discovery unlocks a fascinating secret about the most famous Mayan temple. (Repeat).

The inside story of the Hubble Telescope and the team of engineers, scientists and astronauts who built it. (Repeat).

The inside story of the Hubble Telescope and the team of engineers, scientists and astronauts who built it. (Repeat).

Take flight over Crete's ancient palaces, the jewels of the Dodecanese, and other stunning eastern islands of Greece. (Repeat).

Hideyoshi risks everything he has worked for when he invades mainland China. (Repeat).

After carefully watching and waiting, a wily veteran Samurai emerges from the shadows and launches his own bid for supreme power. (Repeat).

Custom-made rovers offer sightseers exclusive access to polar bears in northern Canada while the Twin Otter takes to the artic sky dropping supplies to isolated villages. In the mountains of Norway, a train-mounted blower keeps the railways clear. (Repeat).

A team of experts uses an engineering marvel to access a perilous place covered in the snow. (Repeat).

A deicer that protects the planes at Canada's airport from its cold temperature; Testing a drone in Switzerland that is shaped like a drone; The comfort from SnoBear while ice fishing. (Repeat).

Every year pilgrims complete the Camino de Santiago, a journey to the shrine of St. James in Santiago de Compostela, Spain. Included: whether the Christian pilgrimage has older pagan roots, and if the most famous of its sacred sites a burial place of a heretic. (Repeat).

The first mission to Mars in the 1970s is remembered by the engineers who oversaw it. (Repeat).

Take a cross-country flight over Ireland's natural wonders and ancient ruins. In this spectacular overview of the historically significant Emerald Isle, we soar over Neolithic tombs of the Celtic era, medieval castles of the Vikings, and modern cities humming with life. From the tower that inspired a novelist to the ancestral home of a famous stout, we explore the sites, the people, and the milestones of this unique gem of Western Europe. (Repeat).

Exploring ship graveyards, including Scapa Flow in Orkney, where German warships were scuttled after the First World War, and Mallows Bay, the home of 200 wrecks colonized by wildlife. (Repeat).

Dig up artifacts virtually using stunning satellite imagery. See evidence of female power in ancient Kush, secrets long buried in a New Mexico pueblo, a shocking find near the amazing Nazca Lines in Peru, and new mysteries in Cambodia's Angkor Wat. (Repeat).

The world's water resources are in crisis. What can we do to reverse the tide? (Repeat).

The first mission to Mars in the 1970s is remembered by the engineers who oversaw it. (Repeat).

Every year pilgrims complete the Camino de Santiago, a journey to the shrine of St. James in Santiago de Compostela, Spain. Included: whether the Christian pilgrimage has older pagan roots, and if the most famous of its sacred sites a burial place of a heretic. (Repeat).

The first mission to Mars in the 1970s is remembered by the engineers who oversaw it. (Repeat).