An American ghost town in the Amazon jungle, a secret Nazi base, and a deadly concrete fortress 866 miles long are mysterious deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

Strange markings in the remote reaches of Northern Finland; drones find a Manhattan-sized mystery in the depths of a Vietnamese cave; secrets are no longer hidden in the Antarctic; a lost sky-high world in Mozambique gets a visit from above.

The legendary city of Kish, Iraq, lies at the cradle of human civilization and home to some of the world's first kings; using cutting-edge tech, experts investigate the buried secrets of this lost city to uncover the first origins of royalty.

Two crashed Cessnas baffle investigators.

An American ghost town in the Amazon jungle, a secret Nazi base, and a deadly concrete fortress 866 miles long are mysterious deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

Strange markings in the remote reaches of Northern Finland; drones find a Manhattan-sized mystery in the depths of a Vietnamese cave; secrets are no longer hidden in the Antarctic; a lost sky-high world in Mozambique gets a visit from above.

The legendary city of Kish, Iraq, lies at the cradle of human civilization and home to some of the world's first kings; using cutting-edge tech, experts investigate the buried secrets of this lost city to uncover the first origins of royalty.

For more than 25 years, the shuttle was our ticket to space and our laboratory in orbit.

The vast majority of information being gathered about Mars is by orbiters chronicling everything they can.

A journey along Ireland's longest river, the Shannon, through an emerald green landscape of rolling hills and sparkling waters; how Vikings, monks and kings have all made their mark.

Heading south from Inuvik, NWT - we embark on one of the world's great road trips - following the Northern half of the Dempster Highway - from Inuvik to the Arctic Circle.

Tracing the southern half of the Dempster Highway, over some of the world's most remote Earthly wonders, from the Arctic Circle on the way to the Klondike River and Dawson City.

An exploration of the route that has become known as the Klondike Trail.

Investigators determine why a plane crashes on Alaska's Kenai Peninsula.

Three Hollywood actresses become real-life princesses: Grace Kelly, Gloria Swanson and Rita Hayworth.

The world has its focus on the Pyramid of Khufu in Egypt, but nearby on the Giza plateau, other architectural masterpieces stand the test of time.

Exploring the early years of Prohibition, including its origins, the pervasiveness of speakeasies and the rise of organized crime.

Three Hollywood actresses become real-life princesses: Grace Kelly, Gloria Swanson and Rita Hayworth.

The world has its focus on the Pyramid of Khufu in Egypt, but nearby on the Giza plateau, other architectural masterpieces stand the test of time.

By the summer of 1944, the United States is gaining the upper hand in the Pacific War with better training, troop numbers and supply lines; it aims for the heart of Japan's inner defense ring, engaging in a naval battle for Saipan in the Marianas.

Strange markings in the remote reaches of Northern Finland; drones find a Manhattan-sized mystery in the depths of a Vietnamese cave; secrets are no longer hidden in the Antarctic; a lost sky-high world in Mozambique gets a visit from above.

The legendary city of Kish, Iraq, lies at the cradle of human civilization and home to some of the world's first kings; using cutting-edge tech, experts investigate the buried secrets of this lost city to uncover the first origins of royalty.

A gun battle between government agents and Branch Davidians leads to one of the longest standoffs in American history; the story behind the siege features new footage and firsthand accounts from survivors, law enforcement agents and eyewitnesses.

Exploring largely unknown World War II stories and heroes.

Consider the factors that inevitably cause dictatorships to crumble; look at how hubris destroys cults of personality; see how factions fracture military dictatorships; weigh the miscalculations that turn the tide against tyranny.

A gun battle between government agents and Branch Davidians leads to one of the longest standoffs in American history; the story behind the siege features new footage and firsthand accounts from survivors, law enforcement agents and eyewitnesses.

Exploring largely unknown World War II stories and heroes.

Consider the factors that inevitably cause dictatorships to crumble; look at how hubris destroys cults of personality; see how factions fracture military dictatorships; weigh the miscalculations that turn the tide against tyranny.

Investigators determine why a plane crashes on Alaska's Kenai Peninsula.

A gun battle between government agents and Branch Davidians leads to one of the longest standoffs in American history; the story behind the siege features new footage and firsthand accounts from survivors, law enforcement agents and eyewitnesses.

Exploring largely unknown World War II stories and heroes.

Consider the factors that inevitably cause dictatorships to crumble; look at how hubris destroys cults of personality; see how factions fracture military dictatorships; weigh the miscalculations that turn the tide against tyranny.

Exploring the Milky Way from the mythology of ancient sky watchers to how scientists are mapping it from the inside out.

Examining the science behind the birth of the universe.

The journey down the attraction-packed Niagara River is filled with adventure and beauty; navigating the fascinating history and engineering of this border river between Canada and the United States, arriving at the world-famous Niagara Falls.

Exploring the Carcross Desert, Tatshenshini-Alsek Provincial Park, and the eastern edge of Kluane National Park.

City of Whitehorse to the Kluane National Park.

Tourists explore the far reaches of northern Canada and gain exclusive access to polar bears on custom-built rovers; the Twin Otter aircraft drops much-needed supplies to isolated villages.

A mystery emerges after a single-engine floatplane crashes.

The story of the greatest tank battle the world has ever seen.

Eye-witness accounts from those who fought in the US military's bloodiest battle on the European front in World War II.

Incredible footage, colourised for the first time, chronicles the final days of the Third Reich and the brutal battle for Berlin, though German defeat looked certain. Nazi soldiers persisted fighting despite the inevitability of their downfall.

In 1943, the United States engages in a new series of island-hopping invasions; the first stop is the Tarawa Atoll, where troops embark upon the largest amphibious invasion ever staged in the Pacific to fight one of the costliest battles of the war.

By the summer of 1944, the United States is gaining the upper hand in the Pacific War with better training, troop numbers and supply lines; it aims for the heart of Japan's inner defense ring, engaging in a naval battle for Saipan in the Marianas.

A gun battle between government agents and Branch Davidians leads to one of the longest standoffs in American history; the story behind the siege features new footage and firsthand accounts from survivors, law enforcement agents and eyewitnesses.

Exploring largely unknown World War II stories and heroes.

Dictators often attempt to expand their jurisdiction beyond the borders of their country; this usually means armed invasion and the death of large numbers of soldiers and civilians.

It is 1943, and the Allies launch a campaign to liberate Italy from the occupying Nazi forces; Military experts use the latest drone imaging technology to understand how the Nazis used the Italian landscape to their advantage.

A different view of the events in the Arctic during World War II, with countless unknown details; a focus on the struggle of the great powers for control of the area and its natural resources.

The German U-boat hunters become the hunted as advances in technology turn the tide in the Allies' favor.

It is 1943, and the Allies launch a campaign to liberate Italy from the occupying Nazi forces; Military experts use the latest drone imaging technology to understand how the Nazis used the Italian landscape to their advantage.

A different view of the events in the Arctic during World War II, with countless unknown details; a focus on the struggle of the great powers for control of the area and its natural resources.

The German U-boat hunters become the hunted as advances in technology turn the tide in the Allies' favor.

A mystery emerges after a single-engine floatplane crashes.

It is 1943, and the Allies launch a campaign to liberate Italy from the occupying Nazi forces; Military experts use the latest drone imaging technology to understand how the Nazis used the Italian landscape to their advantage.

A different view of the events in the Arctic during World War II, with countless unknown details; a focus on the struggle of the great powers for control of the area and its natural resources.

The German U-boat hunters become the hunted as advances in technology turn the tide in the Allies' favor.

Mercury, one of the nearest planets to earth, has eluded astronomers' best efforts to learn its secrets until missions like Mariner and Messenger.

Examining how cosmic rays are produced and what that can tell us about the universe.

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

A wind farm depends on the all-terrain abilities of the Hagglund BV206 in Sweden.

A special drone uses cutting-edge technology to fly deep into treacherous, hard-to-reach mountains on dangerous search and rescue missions, and a hi-tech ice machine works tirelessly at a Toronto airport to keep flights running in brutal conditions.

Exploring machines invented for human survival in the extreme cold across the planet.

A trip goes wrong when a pilot's Piper Super Cub crashes into a treacherous waterway.

The Pyramid of Khufu is the only one of the Seven Wonders of the Ancient World which can still be seen in its original state.

At the heart of Saqqara, the largest necropolis in Egypt is the Step Pyramid of Djoser, built around 2600 BC.

Meidum is the least-known of the pyramids of Egypt as it stretches skywards to resemble a castle keep.

On the site of Dahshur, south of Cairo, are two revolutionary monuments which seem to be the first real pyramids.

The world has its focus on the Pyramid of Khufu in Egypt, but nearby on the Giza plateau, other architectural masterpieces stand the test of time.

It is 1943, and the Allies launch a campaign to liberate Italy from the occupying Nazi forces; Military experts use the latest drone imaging technology to understand how the Nazis used the Italian landscape to their advantage.

A different view of the events in the Arctic during World War II, with countless unknown details; a focus on the struggle of the great powers for control of the area and its natural resources.

The German U-boat hunters become the hunted as advances in technology turn the tide in the Allies' favor.

A K9 anti-poaching squad flies into action, a heavy-lift helicopter flies emergency supply missions across a storm-ravaged island and an airliner races to reach its destination before a power outage plunges the airport into dark.

At Monster Jam, custom-built monster trucks roll, flip, and fly through the air. With the metal-bending beating these trucks endure, teams of specialized mechanics race against the clock to repair these engineering marvels in time for the next event.

A 1.2 million square foot office building balances precariously on a 39 foot wide base in Chicago. A building named Pterodactyl lands on top of a Los Angeles parking garage. And the world's longest suspension footbridge.

A K9 anti-poaching squad flies into action, a heavy-lift helicopter flies emergency supply missions across a storm-ravaged island and an airliner races to reach its destination before a power outage plunges the airport into dark.

At Monster Jam, custom-built monster trucks roll, flip, and fly through the air. With the metal-bending beating these trucks endure, teams of specialized mechanics race against the clock to repair these engineering marvels in time for the next event.

A 1.2 million square foot office building balances precariously on a 39 foot wide base in Chicago. A building named Pterodactyl lands on top of a Los Angeles parking garage. And the world's longest suspension footbridge.

A trip goes wrong when a pilot's Piper Super Cub crashes into a treacherous waterway.

A K9 anti-poaching squad flies into action, a heavy-lift helicopter flies emergency supply missions across a storm-ravaged island and an airliner races to reach its destination before a power outage plunges the airport into dark.

At Monster Jam, custom-built monster trucks roll, flip, and fly through the air. With the metal-bending beating these trucks endure, teams of specialized mechanics race against the clock to repair these engineering marvels in time for the next event.

A 1.2 million square foot office building balances precariously on a 39 foot wide base in Chicago. A building named Pterodactyl lands on top of a Los Angeles parking garage. And the world's longest suspension footbridge.

The Fermi Paradox asks why another civilization has not presented itself.

Examining Landsat 8, the advanced planetary explorer with a 900 million dollar price tag, which is designed to reveal complex and ever-changing details undetectable by the human eye.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

Crawling down the Red River, the Amphibex protects those who live along it during the thaw, while the Hercules C-130 J takes to the Arctic skies of the Canadian North; preparing for summer exploratory missions is Swedish built icebreaker Oden.

Military search and rescue efforts in deadly arctic conditions rely on a specialized helicopter with unrivaled power and endurance, and special access reveals how it works; in the Alps, a monster snow blower keeps trains running in dangerous weather.

The Yeti is a custom-made snow-eater that keeps a critical Alaskan airport open for business; experts reveal how cutting-edge engineering and the latest technology keep this machine running in the toughest conditions.

Evidence is lost to a fire after a Cessna crash on a public road, challenging investigators.

Women who blazed a trail through the arts world: Winnaretta Singer, Sara Murphy and Peggy Guggenheim.

The story of the construction of ancient Egypt's first pyramid, built 4,700 years ago to help the Pharaoh Djoser achieve immortality.

The war between police and gangsters during Prohibition transforms law enforcement in the United States.

Women who blazed a trail through the arts world: Winnaretta Singer, Sara Murphy and Peggy Guggenheim.

The story of the construction of ancient Egypt's first pyramid, built 4,700 years ago to help the Pharaoh Djoser achieve immortality.

Look at the opening acts of WW II as the Soviets launch their Winter War in Finland; see why the global media focused on the grim, snowy fighting while the Axis turned its eyes toward neighboring Norway and the rich mineral wealth of the north.

An American ghost town in the Amazon jungle, a secret Nazi base, and a deadly concrete fortress 866 miles long are mysterious deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

The origins of the Greek mythology about Amazons may lie with the ancient nomadic warriors of the Eurasian grasslands; hailing from the Scythian tribes, these warriors controlled a swathe from Eastern Europe to Central Asia.

Capturing from high, the islands Crete, Samos, Chios, Rhodes and the Dodecanese; exploring the distinct culture and unique stories of these islands.

As winter approaches, the maintenance crews at Ted Stevens International Airport battle many elements to keep things running.

A skilled canine team tracks birds disrupting Africa's busiest airport. Mechanics race to fix a cargo hauler for the largest bush airline. Helicopter pilots meet ships near the Cape of Good Hope, while flying doctors deliver life-saving surgery.

Capturing from high, the islands Crete, Samos, Chios, Rhodes and the Dodecanese; exploring the distinct culture and unique stories of these islands.

As winter approaches, the maintenance crews at Ted Stevens International Airport battle many elements to keep things running.

A skilled canine team tracks birds disrupting Africa's busiest airport. Mechanics race to fix a cargo hauler for the largest bush airline. Helicopter pilots meet ships near the Cape of Good Hope, while flying doctors deliver life-saving surgery.

Evidence is lost to a fire after a Cessna crash on a public road, challenging investigators.

Capturing from high, the islands Crete, Samos, Chios, Rhodes and the Dodecanese; exploring the distinct culture and unique stories of these islands.

As winter approaches, the maintenance crews at Ted Stevens International Airport battle many elements to keep things running.

A skilled canine team tracks birds disrupting Africa's busiest airport. Mechanics race to fix a cargo hauler for the largest bush airline. Helicopter pilots meet ships near the Cape of Good Hope, while flying doctors deliver life-saving surgery.

A vehicle the size of a small car spent a year on Mars.

Historical and modern examinations of constellations.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

A helicopter made for extreme environments aids US Army rescue efforts in some of the most harsh conditions; a trio of small but capable tugboats moves cargo vessels through the busiest port of Alaska.

Navigating the narrow, deep fjords that lead to Narvik, Norway, where German and British forces faced off in April 1940; repeated torpedo failures threatened to sink the mission and leave Hitler's invading troops exposed and vulnerable.

Learning why a clash over Nazi ideology wrecked a bright U-boat commander's career.

The Navy's U.S.S. Macon flew in the 1930's, the golden age of airships, and was able to both launch and recover airplanes; telling the lost story of America's airships, their rapid rise, tragic demise, and the bold experiments in between.

American heiresses Barbara Hutton, Clara Ward and "Kick" Kennedy search for love in Europe, but find tragedy instead.

Exploring how Pharaoh Snefru shifted the pyramid age into high gear by ordering three massive monuments.

An investigation into physicist Stephen Hawking's theory that humans should leave Earth to make a new home on another planet; scientists explore what it would take to formulate an interstellar escape plan and colonize outer space.

American heiresses Barbara Hutton, Clara Ward and "Kick" Kennedy search for love in Europe, but find tragedy instead.

Exploring how Pharaoh Snefru shifted the pyramid age into high gear by ordering three massive monuments.

The German war industry urgently needs more iron; Hitler has his eye on the Norwegian coast and especially on the harbor of Narvik, through which iron ore is shipped from Sweden.

As winter approaches, the maintenance crews at Ted Stevens International Airport battle many elements to keep things running.

A skilled canine team tracks birds disrupting Africa's busiest airport. Mechanics race to fix a cargo hauler for the largest bush airline. Helicopter pilots meet ships near the Cape of Good Hope, while flying doctors deliver life-saving surgery.

At Monster Jam, custom-built monster trucks roll, flip, and fly through the air. With the metal-bending beating these trucks endure, teams of specialized mechanics race against the clock to repair these engineering marvels in time for the next event.

A 1.2 million square foot office building balances precariously on a 39 foot wide base in Chicago. A building named Pterodactyl lands on top of a Los Angeles parking garage. And the world's longest suspension footbridge.

A different view of the events in the Arctic during World War II, with countless unknown details; a focus on the struggle of the great powers for control of the area and its natural resources.

At Monster Jam, custom-built monster trucks roll, flip, and fly through the air. With the metal-bending beating these trucks endure, teams of specialized mechanics race against the clock to repair these engineering marvels in time for the next event.

A 1.2 million square foot office building balances precariously on a 39 foot wide base in Chicago. A building named Pterodactyl lands on top of a Los Angeles parking garage. And the world's longest suspension footbridge.

A different view of the events in the Arctic during World War II, with countless unknown details; a focus on the struggle of the great powers for control of the area and its natural resources.

The Navy's U.S.S. Macon flew in the 1930's, the golden age of airships, and was able to both launch and recover airplanes; telling the lost story of America's airships, their rapid rise, tragic demise, and the bold experiments in between.

At Monster Jam, custom-built monster trucks roll, flip, and fly through the air. With the metal-bending beating these trucks endure, teams of specialized mechanics race against the clock to repair these engineering marvels in time for the next event.

A 1.2 million square foot office building balances precariously on a 39 foot wide base in Chicago. A building named Pterodactyl lands on top of a Los Angeles parking garage. And the world's longest suspension footbridge.

A different view of the events in the Arctic during World War II, with countless unknown details; a focus on the struggle of the great powers for control of the area and its natural resources.

Studies are currently under way looking for evidence of dark energy in the movement of galaxies.

Lunar and solar eclipses.

Bill Nighy leads a magical journey in the Norfolk Broads along England's holiday river, the River Bure; discovering a watery world where both wildlife and recreation go hand in hand.

Retracing the steps of a German U-boat that's willing to do anything to replace its dwindling fuel and food stores, and get back to port; examining how the crew, plagued by scurvy, turns the tables on the US submarines that try to ram their ship.

A US sub shows unbelievable courage in the face of impossible odds. A look into how a bomb dropped by the Japanese forces pushes the craft into a deadly dive, and ignites a toxic chemical fire that leaves the crew fighting for their lives.

A look at the failures that forced a US submarine commander to rebuild his crew's trust, one person at a time; discovering how this commanding officer overcame dissent on board and refocused on targeting enemy ships in dangerous Japanese waters.

A remote island linked to one of the world's most famous aviation mysteries; thousands of shipwrecks in the Bermuda triangle; a history lost and found in the South Pacific; a 10,000-year-old mystery in the murky depths of the Yucatan Peninsula.

Three American heiresses become leading ladies in England: Nancy Astor, Nancy Lancaster and Pauline de Rothschild.

Investigating whether the pharaoh who ordered the building of the Great Pyramid of Giza was really the tyrant he was said to be.

An unprecedented journey through New Zealand with Phil Keoghan; from helicopters and hot air balloons to sailboats and a WWI plane.

Three American heiresses become leading ladies in England: Nancy Astor, Nancy Lancaster and Pauline de Rothschild.

Investigating whether the pharaoh who ordered the building of the Great Pyramid of Giza was really the tyrant he was said to be.

Investigate the costs of Hitler's Soviet invasion, which aims to give the Nazis control over a key nickel mine and a transportation hub; seeing how this summer battle turns into a bitter winter war as the Allies tighten their grip on the Arctic.

At Monster Jam, custom-built monster trucks roll, flip, and fly through the air. With the metal-bending beating these trucks endure, teams of specialized mechanics race against the clock to repair these engineering marvels in time for the next event.

A 1.2 million square foot office building balances precariously on a 39 foot wide base in Chicago. A building named Pterodactyl lands on top of a Los Angeles parking garage. And the world's longest suspension footbridge.

The excavation unearths new finds; Miami University professor Steven Tuck joins the team to look for evidence of Pompeiians who may have survived the eruption of AD 79.

The Agoojj are a small fighting force of women in West Africa that expands in the 17th century against the much larger Asante and Yoruba Kingdoms; this all-female regiment terrifies both the local populations and the Europeans sent to conquer them.

New evidence found in Egyptian sacred sites is revealing secrets about a forgotten succession of powerful female priests.

The excavation unearths new finds; Miami University professor Steven Tuck joins the team to look for evidence of Pompeiians who may have survived the eruption of AD 79.

The Agoojj are a small fighting force of women in West Africa that expands in the 17th century against the much larger Asante and Yoruba Kingdoms; this all-female regiment terrifies both the local populations and the Europeans sent to conquer them.

New evidence found in Egyptian sacred sites is revealing secrets about a forgotten succession of powerful female priests.

A remote island linked to one of the world's most famous aviation mysteries; thousands of shipwrecks in the Bermuda triangle; a history lost and found in the South Pacific; a 10,000-year-old mystery in the murky depths of the Yucatan Peninsula.

The excavation unearths new finds; Miami University professor Steven Tuck joins the team to look for evidence of Pompeiians who may have survived the eruption of AD 79.

The Agoojj are a small fighting force of women in West Africa that expands in the 17th century against the much larger Asante and Yoruba Kingdoms; this all-female regiment terrifies both the local populations and the Europeans sent to conquer them.

New evidence found in Egyptian sacred sites is revealing secrets about a forgotten succession of powerful female priests.

An exploration of the astrophysics of stars creating matter.

An exploration of the science behind the Anthropic Principle.

Traveling the Dordogne River via traditional boats through the green heart of southwest France; drinking wine and hunting for truffles; riding a luxury cruiser to a lighthouse built for a king.

An American submarine crew gets an order: to hunt Japanese ships that are conducting a secret VIP evacuation in the Philippines in June 1945; examining the stealthy, dangerous tactics they used that would set a US Navy record.

U.S. paratroopers that dropped into France before the D-Day landings battle Nazi defenders for a key bridge behind enemy lines.

Five months after D-Day, the ground war finally arrives on German soil as British soldiers attack in the shadow of Hitler's infamous Siegfried Line.

When seen from above, the pyramids of Giza align with the stars; survivors of Katrina find rescue when least expected; a volcano burns bright blue; a forgotten beach reveals its secrets.

A new raven breeding program begins at the Tower of London as the retiring governor prepares to commemorate Queen Elizabeth's 93rd birthday.

Exploring the final building phase of the Great Pyramid of Giza and the rituals that took place after a pharaoh dies.

An unprecedented look at the world's most famous aircraft: how it was born, how it has developed over the years, and the role it has played in historic events.

A new raven breeding program begins at the Tower of London as the retiring governor prepares to commemorate Queen Elizabeth's 93rd birthday.

Exploring the final building phase of the Great Pyramid of Giza and the rituals that took place after a pharaoh dies.

Allied forces move to take the valuable islands of Tinian and Guam that threaten American air operations; meanwhile, Gen. Curtis LeMay is tasked with planning and executing a fire bombing campaign against Japan.

The excavation unearths new finds; Miami University professor Steven Tuck joins the team to look for evidence of Pompeiians who may have survived the eruption of AD 79.

New evidence found in Egyptian sacred sites is revealing secrets about a forgotten succession of powerful female priests.

A terrifying sea fortress, a highway in the Amazon that suddenly vanishes, and a mysterious structure in the shadow of the Statue of Liberty are deserted engineering projects; discoveries reveal how they were built and why they were abandoned.

Drones reveal what's left of Henry Ford's American suburb in the Brazilian jungle; looking for clues to what killed a once-vibrant Pennsylvania mining town; an aerial glimpse of New York's forgotten ghost town; an Italian Renaissance reduced to dust.

The ancient necropolis of Abusir contains strange megastructures unlike any discovered in Egypt; experts gain rare access to investigate lost tombs and forgotten rituals to reveal the secrets of Egypt's Sun Cult pharaohs.

A terrifying sea fortress, a highway in the Amazon that suddenly vanishes, and a mysterious structure in the shadow of the Statue of Liberty are deserted engineering projects; discoveries reveal how they were built and why they were abandoned.

Drones reveal what's left of Henry Ford's American suburb in the Brazilian jungle; looking for clues to what killed a once-vibrant Pennsylvania mining town; an aerial glimpse of New York's forgotten ghost town; an Italian Renaissance reduced to dust.

The ancient necropolis of Abusir contains strange megastructures unlike any discovered in Egypt; experts gain rare access to investigate lost tombs and forgotten rituals to reveal the secrets of Egypt's Sun Cult pharaohs.

When seen from above, the pyramids of Giza align with the stars; survivors of Katrina find rescue when least expected; a volcano burns bright blue; a forgotten beach reveals its secrets.

A terrifying sea fortress, a highway in the Amazon that suddenly vanishes, and a mysterious structure in the shadow of the Statue of Liberty are deserted engineering projects; discoveries reveal how they were built and why they were abandoned.

Drones reveal what's left of Henry Ford's American suburb in the Brazilian jungle; looking for clues to what killed a once-vibrant Pennsylvania mining town; an aerial glimpse of New York's forgotten ghost town; an Italian Renaissance reduced to dust.

The ancient necropolis of Abusir contains strange megastructures unlike any discovered in Egypt; experts gain rare access to investigate lost tombs and forgotten rituals to reveal the secrets of Egypt's Sun Cult pharaohs.

Isaac Brock's daring made him a hero, but may also be his flaw.

Charles de Salaberry is forced to rely on cunning tactics.

A journey down Spain's Guadalquivir River, from the high Sierra de Cazorla down to Andalusia; passing through Cordoba and Seville, following the footsteps of Columbus and Magellan.

A platoon of American Buffalo Soldiers exceeds all expectations to advance on a Nazi-occupied castle in the foothills of Northern Italy.

With thousands of German soldiers trapped in the Falaise Pocket, a small Canadian tank squadron tries to close off the escape route.

A U.S. Parachute Infantry Regiment rushes to protect a critical bridge from a Nazi battle group during the opening days of the Battle of the Bulge.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

A behind-the-scenes look at an ambitious war commemoration and retirement gala; a look back at the Tower's vital role during times of war.

Egyptologists try to determine who built the Sphinx and why by exploring the power struggles between Khufu's sons after the pharaoh's death.

Investigators try to determine what caused a routine commuter flight to crash.

A behind-the-scenes look at an ambitious war commemoration and retirement gala; a look back at the Tower's vital role during times of war.

Egyptologists try to determine who built the Sphinx and why by exploring the power struggles between Khufu's sons after the pharaoh's death.

Allies slug it out on the island of Peleliu in a campaign to pave the way for Gen. MacArthur's return to the Philippines; footage shows troops enduring the muddy muck in the Philippines; Japan unveils a devastating new tactic, the kamikaze.

Drones reveal what's left of Henry Ford's American suburb in the Brazilian jungle; looking for clues to what killed a once-vibrant Pennsylvania mining town; an aerial glimpse of New York's forgotten ghost town; an Italian Renaissance reduced to dust.

The ancient necropolis of Abusir contains strange megastructures unlike any discovered in Egypt; experts gain rare access to investigate lost tombs and forgotten rituals to reveal the secrets of Egypt's Sun Cult pharaohs.

The terrorist attack on Charlie Hebdo and Paris in January 2015.

First-hand accounts, re-creations and expert interviews of D-Day in 1944, where the Allied Forces of Britain, America, Canada and France attacked German forces on the coast of Normandy, France.

U.S. paratroopers that dropped into France before the D-Day landings battle Nazi defenders for a key bridge behind enemy lines.

The terrorist attack on Charlie Hebdo and Paris in January 2015.

First-hand accounts, re-creations and expert interviews of D-Day in 1944, where the Allied Forces of Britain, America, Canada and France attacked German forces on the coast of Normandy, France.

U.S. paratroopers that dropped into France before the D-Day landings battle Nazi defenders for a key bridge behind enemy lines.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

The terrorist attack on Charlie Hebdo and Paris in January 2015.

First-hand accounts, re-creations and expert interviews of D-Day in 1944, where the Allied Forces of Britain, America, Canada and France attacked German forces on the coast of Normandy, France.

U.S. paratroopers that dropped into France before the D-Day landings battle Nazi defenders for a key bridge behind enemy lines.

With her husband wounded, Laura Secord sets out to warn the British of a possible American attack.

Tecumseh forges an alliance with the British in pursuit of his dream.

Discover the stories of six epic river journeys via the fascinating characters who live and work on and around the water.

Blinded in one eye in the battle for Normandy, a defiant French-Canadian sniper sets out to liberate a Dutch city in the final days of the war.

After the landing on Normandy Beach, the Battle of Carentan breaks out and an American unit launches a desperate bayonet charge.

After months of fighting in Europe, U.S. troops finally enter Germany; with their sights set on the city of Aachen, the Americans must break through two rows of bunker fortifications to capture the old capital.

An underwater discovery from a violent past; strange open ocean spirals off the coast of Australia; a mysterious concrete ghost island; never-seen-before tracks discovered along the seabed.

Look at the opening acts of WW II as the Soviets launch their Winter War in Finland; see why the global media focused on the grim, snowy fighting while the Axis turned its eyes toward neighboring Norway and the rich mineral wealth of the north.

The German war industry urgently needs more iron; Hitler has his eye on the Norwegian coast and especially on the harbor of Narvik, through which iron ore is shipped from Sweden.

Investigate the costs of Hitler's Soviet invasion, which aims to give the Nazis control over a key nickel mine and a transportation hub; seeing how this summer battle turns into a bitter winter war as the Allies tighten their grip on the Arctic.

Allied forces move to take the valuable islands of Tinian and Guam that threaten American air operations; meanwhile, Gen. Curtis LeMay is tasked with planning and executing a fire bombing campaign against Japan.

Allies slug it out on the island of Peleliu in a campaign to pave the way for Gen. MacArthur's return to the Philippines; footage shows troops enduring the muddy muck in the Philippines; Japan unveils a devastating new tactic, the kamikaze.

The terrorist attack on Charlie Hebdo and Paris in January 2015.

First-hand accounts, re-creations and expert interviews of D-Day in 1944, where the Allied Forces of Britain, America, Canada and France attacked German forces on the coast of Normandy, France.

Consider the factors that inevitably cause dictatorships to crumble; look at how hubris destroys cults of personality; see how factions fracture military dictatorships; weigh the miscalculations that turn the tide against tyranny.

Between 1940 and 1942, the Axis powers unleash over 3,000 bombing raids on Malta, an island key to controlling the southern coast of the Mediterranean; Conflict archeologists use cutting-edge drone technology to explore the defenses of Malta.

A different view of the events in the Arctic during World War II, with countless unknown details; a focus on the struggle of the great powers for control of the area and its natural resources.

Allied convoys resupplying the Soviet Union navigate the Arctic, infested with U-boats and enemy aircraft.

Between 1940 and 1942, the Axis powers unleash over 3,000 bombing raids on Malta, an island key to controlling the southern coast of the Mediterranean; Conflict archeologists use cutting-edge drone technology to explore the defenses of Malta.

A different view of the events in the Arctic during World War II, with countless unknown details; a focus on the struggle of the great powers for control of the area and its natural resources.

Allied convoys resupplying the Soviet Union navigate the Arctic, infested with U-boats and enemy aircraft.

An underwater discovery from a violent past; strange open ocean spirals off the coast of Australia; a mysterious concrete ghost island; never-seen-before tracks discovered along the seabed.

Between 1940 and 1942, the Axis powers unleash over 3,000 bombing raids on Malta, an island key to controlling the southern coast of the Mediterranean; Conflict archeologists use cutting-edge drone technology to explore the defenses of Malta.

A different view of the events in the Arctic during World War II, with countless unknown details; a focus on the struggle of the great powers for control of the area and its natural resources.

Allied convoys resupplying the Soviet Union navigate the Arctic, infested with U-boats and enemy aircraft.

John Norton leads Six Nations warriors against the invading Americans.

East coast shipper creates a private fleet to seize American ships.

Rumoured to be the cleanest river in Europe, few dispute it's the coldest; cascading down from the Dinaric Alps in Serbia, it soon crosses the border into Bosnia Herzegovina, where marine biologist and fisherman Sanel Riđanović casts for salmon.

A Japanese American regiment fights through darkened forests, heavy rains and entrenched Nazis to reach a lost U.S. battalion in the Vosges Mountains.

During the Battle of the Bulge, a young U.S. scout gets trapped behind enemy lines.

A United States army cook manages to stall Himmler's attempt to recapture Strasbourg.

Revealing the truth behind the planet's ancient legends; touring an island covered in polar bears, twin craters in Greece, peeking at a supervolcano hidden under Yellowstone Park and examining an ocean formation that's eerily similar to Atlantis.

The story of the construction of ancient Egypt's first pyramid, built 4,700 years ago to help the Pharaoh Djoser achieve immortality.

Exploring how Pharaoh Snefru shifted the pyramid age into high gear by ordering three massive monuments.

Investigating whether the pharaoh who ordered the building of the Great Pyramid of Giza was really the tyrant he was said to be.

Exploring the final building phase of the Great Pyramid of Giza and the rituals that took place after a pharaoh dies.

Egyptologists try to determine who built the Sphinx and why by exploring the power struggles between Khufu's sons after the pharaoh's death.

Between 1940 and 1942, the Axis powers unleash over 3,000 bombing raids on Malta, an island key to controlling the southern coast of the Mediterranean; Conflict archeologists use cutting-edge drone technology to explore the defenses of Malta.

A different view of the events in the Arctic during World War II, with countless unknown details; a focus on the struggle of the great powers for control of the area and its natural resources.

Allied convoys resupplying the Soviet Union navigate the Arctic, infested with U-boats and enemy aircraft.