The space telescope Hipparcos led to a discovery that sent shockwaves throughout the astronomical community: a star appearing to be older than the universe itself.

Gregg Wallace explores a factory that produces 625,000 sausages a day; Cherry is at the University of Chester getting the lowdown on getting the best from a banger; Ruth Goodman is investigating how a German bratwurst became top dog.

Polar landscapes in autumn are transformed as the big freeze returns; in the Arctic, polar bears gather in large numbers on the coast to wait for the return of the ice; off the coast 2,000 beluga whales head for a special estuary.

The Australian outback is covered in pale spots, the work of wombats; a clearing in the green canopy of the Congo rainforest has been created by an elephant gathering; the twists and turns of the Amazon make a home for rehabilitated manatees.

The four categories of cute in the animal kingdom, and the scientific stories behind why animals are cute.

An aerial journey along the shores of Lake Superior, exploring the city of Thunder Bay and the vast, natural wonders of the world's largest freshwater lake.

Chris starts his season with a massive catch of Tullibee, only to see his happiness cut short; Justin and Mike start in Hecla and hit the motherlode; a critical fish market closes; Richard's close call on the ice.

Frightening ice conditions and poor weather make the early season treacherous; Justin and Mike experience a violent ice-quake that leaves them rattled; Trevor contends with other fishermen setting their nets too close to his.

Caleb Musgrave teaches the Adventurers proper shelter construction.

After a long paddle, Caleb and Brendan learn the art of net-making.

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.

Griff Rhys Jones explores the province of Ontario.

David Attenborough reveals how the unique and bizarre wildlife of the Galápagos Islands is adapting to a human revolution.

From a baby whale in danger to marine iguanas battling storms, a look at how animals survive when faced with challenges of the ocean.

The North and South polar regions of the Earth; the Arctic and Antarctic are the greatest and least known wildernesses.

Spring in the polar regions; the greatest seasonal transformation of the planet begins with the return of the sun.

It is high summer in the polar regions, and the sun never sets; many species take advantage of the easier conditions, but summer is a tough time for the polar bear family, as their ice world melts away and the cubs take their first swimming lesson.

Polar landscapes in autumn are transformed as the big freeze returns; in the Arctic, polar bears gather in large numbers on the coast to wait for the return of the ice; off the coast 2,000 beluga whales head for a special estuary.

Gregg Wallace receives a load of tea leaves from Kenya and follows their journey through the factory that produces one quarter of all the tea drunk in Britain.

Asia's jungles are beautiful and exceptionally diverse, but whilst they provide shelter, food, and opportunity, they are also full of dangers and hidden threats.

High above the city of Gibraltar, Barbary macaques, Europe's only non-human primates, live lives full of kidnappings and high drama; in the cemeteries of Vienna Grave Robbing European hamsters do battle with each other for food.

Wandering in the spaces between and beyond the planets, where countless worlds exist without any light at all; peeking inside hidden realms that stretch halfway to the nearest star and find out what lies outside the reaches of the most powerful telescopes.

The naturalist visits uncharted territory in the Guiana Shield, finding wildlife that have never encountered humans.

High above the city of Gibraltar, Barbary macaques, Europe's only non-human primates, live lives full of kidnappings and high drama; in the cemeteries of Vienna Grave Robbing European hamsters do battle with each other for food.

Wandering in the spaces between and beyond the planets, where countless worlds exist without any light at all; peeking inside hidden realms that stretch halfway to the nearest star and find out what lies outside the reaches of the most powerful telescopes.

The naturalist visits uncharted territory in the Guiana Shield, finding wildlife that have never encountered humans.

A look at how gravity affects the world, and even the solar system.

Brian Cox explores the fundamental properties of light; the secrets of the cosmos.

A danger zone in space above the South Atlantic where lights flash and satellites go haywire; astronauts' first-hand accounts.

Satellites follow an elephant family struggling through drought, reveal previously unknown emperor penguin colonies from the color of their poo and discover mysterious ice rings that could put seal pups in danger.

From high above Sault Ste. Marie, exploring the rugged Lake Huron coastline and scenic lakeside communities.

It's January, and the Ice Vikings confront blizzards and bone-crushing cold on a lake that refuses to freeze solid; Trevor is having a terrible season, and he joins Chris at their basecamp near the Narrows, which leads to tension.

A giant crack in the ice continues to be an obstacle for all crews as they try to set nets in deeper water; Mike and Justin are caught flat-footed when the crack shifts and sends a violent ice quake to shake their location.

As Gabriella feels the effects of a lack of food, Elder Mary arrives with a gift and a teaching.

The Adventurers try bush sushi, paddle to a new island in search of food, and Gabriella is rescued on the open water.

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.

British comedian and travel enthusiast Griff Rhys Jones explores the Frozen Wilds of Canada's North, in the province of Manitoba. From Winnipeg to Churchill, he travels from the Country's coldest City, to a town with more polar bears than people. He tries his hand at dog-sledding and does his best not to freeze, all the while exploring what it is that entices people to the cold, and why the North is so important to Canada.

The winter season grows more erratic, and Alaskans are forced to adapt.

Gregg Wallace explores an enormous factory that produces 450 tons of frozen food each day; he follows the production of frozen potato waffles, from the arrival of 25 tons of potatoes right through dispatch.

Gregg Wallace travels to an enormous pizza factory in the center of Italy, which produces 400,000 frozen pizzas each day.

Gregg Wallace is at Britain's biggest brewery, which produces three million pints of beer a day; he follows the production of Britain's best-selling lager, and gets to grips with brewing terms.

Gregg Wallace goes to a historic factory in Germany that produces 600,000 pencils a day; at materials intake, he is astonished that the main material in a pencil is not lead but graphite; he helps mix this with clay to produce a 250-kilo batch.

Gregg Wallace goes to a cheese factory that produces 3000 tons of spreadable cheese every year; he follows the production of jalapeno chili-flavored cheese, from a 28,000 liter delivery of milk to 5400 squeezy tubes.

Extreme locales include Mount Everest's Khumbu Icefall, the Grand Canyon, and the slopes of Mount Kilimanjaro.

High above the city of Gibraltar, Barbary macaques, Europe's only non-human primates, live lives full of kidnappings and high drama; in the cemeteries of Vienna Grave Robbing European hamsters do battle with each other for food.

In the planet's most densely populated continent, animals live at extremely close quarters with people, from tigers making a home in town to elephants stopping traffic for food.

Professor Brian Cox journeys to the remotest part of the solar system where the mysteries of Saturn, Uranus and Neptune remain in the shadows.

The hostile conditions of Earth's desert regions give rise to the most incredible survival stories on Earth.

In the planet's most densely populated continent, animals live at extremely close quarters with people, from tigers making a home in town to elephants stopping traffic for food.

Professor Brian Cox journeys to the remotest part of the solar system where the mysteries of Saturn, Uranus and Neptune remain in the shadows.

The hostile conditions of Earth's desert regions give rise to the most incredible survival stories on Earth.

Gregg Wallace travels to an enormous pizza factory in the center of Italy, which produces 400,000 frozen pizzas each day.

Gregg Wallace is at Britain's biggest brewery, which produces three million pints of beer a day; he follows the production of Britain's best-selling lager, and gets to grips with brewing terms.

Gregg Wallace goes to a historic factory in Germany that produces 600,000 pencils a day; at materials intake, he is astonished that the main material in a pencil is not lead but graphite; he helps mix this with clay to produce a 250-kilo batch.

Gregg Wallace goes to a cheese factory that produces 3000 tons of spreadable cheese every year; he follows the production of jalapeno chili-flavored cheese, from a 28,000 liter delivery of milk to 5400 squeezy tubes.

Hope tries to save an injured fawn.

An epic, high-altitude journey from Seven Sisters Provincial Park to Salmon Glacier.

Witness jaw-dropping animal spectacles from high above the Earth. Watch a whirling herd of northern nomads, see undersea behemoths show off in the Pacific shallows, track a US porcine stampede, and confront top ocean predators on the Florida coast.

Two birds with wing injuries.

The creation legends of Naikoon Provincial Park; rich sea lion colonies; remote lighthouses.

A vanished Neolithic structure in an Irish farmer's field, an ancient oasis in the remote reaches of a Chinese desert, a centuries-old buried treasure in the UK and a dreaded predator in the Pacific Ocean are discovered by accident using drones.

Exploring Scandinavia's wild and unpredictable coast, beginning around the Swedish Baltic Sea which includes fjords home to eagles, otters, base jumpers and orcas.

Gregg explores the Nottinghamshire factory producing curry sauce; Cherry goes to Guntur, India, to check out their chili production.

From space, satellite cameras reveal that Earth is a kaleidoscope of color; turquoise plankton blooms trigger a feeding frenzy, China turns yellow with rapeseed flowers, and mysterious green lights appear in the ocean.

In the planet's most densely populated continent, animals live at extremely close quarters with people, from tigers making a home in town to elephants stopping traffic for food.

Professor Brian Cox journeys to the remotest part of the solar system where the mysteries of Saturn, Uranus and Neptune remain in the shadows.

The naturalist visits uncharted territory in the Guiana Shield, finding wildlife that have never encountered humans.

Gregg explores the Nottinghamshire factory producing curry sauce; Cherry goes to Guntur, India, to check out their chili production.

Winter is the greatest test for life in the polar regions; in the Arctic, a female polar bear treks into the mountains to give birth; out on the frozen ocean, the entire population of the world's spectacled eider ducks braves the winter.

Zac and Darin get down and dirty as they explore a natural approach to farming through regenerative agriculture and organic food production.

Many leading scientists believe there's a possibility to soon detect the first evidence of extraterrestrial life.

Professor Cox explores the cycles of time that define the lives of humans.

Zac and Darin get down and dirty as they explore a natural approach to farming through regenerative agriculture and organic food production.

Many leading scientists believe there's a possibility to soon detect the first evidence of extraterrestrial life.

Professor Cox explores the cycles of time that define the lives of humans.

Gregg explores the Nottinghamshire factory producing curry sauce; Cherry goes to Guntur, India, to check out their chili production.

Winter is the greatest test for life in the polar regions; in the Arctic, a female polar bear treks into the mountains to give birth; out on the frozen ocean, the entire population of the world's spectacled eider ducks braves the winter.

From space, satellite cameras reveal that Earth is a kaleidoscope of color; turquoise plankton blooms trigger a feeding frenzy, China turns yellow with rapeseed flowers, and mysterious green lights appear in the ocean.

Exploring Scandinavia's wild and unpredictable coast, beginning around the Swedish Baltic Sea which includes fjords home to eagles, otters, base jumpers and orcas.

A group of weasels is ready to be released; a volunteer attempts to rescue an eagle; a gull flies free.

A cultural and geological past told through the stunning landscape of Gwaii Haanas National Park Reserve.

A Nazi weapon designed to turn the tides of WWII in Northern France; a secret Russian military tower in the shadow of the Chernobyl disaster; a forgotten Australian tunnel rumored to hide a nuclear lab; something shocking buried under Alcatraz.

Preparations for the annual open house.

From the San Juan Islands of Washington State to the Kootenays in the east, exploring the pristine, Pacific border region separating Canada and the United States.

Over a hundred massive concrete arrows scattered across America; a giant chalk figure with an oversized phallus on an English hillside; a mysterious hole in the middle of a lake in Southern California.

Exploring the Scandinavian forest, an ancient land shrouded in myth and legend, and its animals, including wolves, lynx, osprey and reindeer.

Gregg Wallace explores an enormous factory that produces 450 tons of frozen food each day; he follows the production of frozen potato waffles, from the arrival of 25 tons of potatoes right through dispatch.

The Earth's surface is changing faster than ever in human history: cities grow, forests disappear and glaciers melt; a man feeds thousands of parakeets in a city; in Sumatra, a female orangutan and her daughter face life in a forest under threat.

Zac and Darin get down and dirty as they explore a natural approach to farming through regenerative agriculture and organic food production.

Many leading scientists believe there's a possibility to soon detect the first evidence of extraterrestrial life.

Professor Cox explores the cycles of time that define the lives of humans.

Gregg Wallace explores an enormous factory that produces 450 tons of frozen food each day; he follows the production of frozen potato waffles, from the arrival of 25 tons of potatoes right through dispatch.

A look at the extraordinary riches and wonders of the polar regions and the people that have been visiting them for thousands of years.

A race to find the planet's 60 deadliest creatures.

A race to find the planet's 60 deadliest creatures.

Steve returns home to the Atlantic waters of the British Isles as he considers the question of what humanity can do to ensure the enduring future of whales.

Gregg Wallace is in Italy, hitching a lift on a train carrying over a thousand tons of wheat to the largest dried pasta factory in the world.

A race to find the planet's 60 deadliest creatures.

A race to find the planet's 60 deadliest creatures.

Steve returns home to the Atlantic waters of the British Isles as he considers the question of what humanity can do to ensure the enduring future of whales.

Gregg Wallace is in Italy, hitching a lift on a train carrying over a thousand tons of wheat to the largest dried pasta factory in the world.

Gregg Wallace explores an enormous factory that produces 450 tons of frozen food each day; he follows the production of frozen potato waffles, from the arrival of 25 tons of potatoes right through dispatch.

A look at the extraordinary riches and wonders of the polar regions and the people that have been visiting them for thousands of years.

The Earth's surface is changing faster than ever in human history: cities grow, forests disappear and glaciers melt; a man feeds thousands of parakeets in a city; in Sumatra, a female orangutan and her daughter face life in a forest under threat.

Exploring the Scandinavian forest, an ancient land shrouded in myth and legend, and its animals, including wolves, lynx, osprey and reindeer.

Two orphaned bobcats struggle to bond.

Soaring high above the incredible landscapes along BC's Kootenay border region.

A Turkish drought reveals a long-lost ancient Basilica and its secrets; a church spire punches through the surface of a toxic sludge in Romania; the hull of a massive ship in the North Sea answers decades old questions.

Hope finally moves into the new rehab and the old buildings come down.

The vast and diverse terrain that lies at the border of Canada and the United States.

Nubian pyramids reveal the rise of female power in Ancient Kush; a shocking satellite image uncovers secrets of an ancient ancestral Puebloan site in New Mexico.

Exploring Scandinavia's kingdoms of fire and ice and the animals - including muskoxen, polar bears and arctic foxes - who must navigate the landscape as it changes around them.

Gregg Wallace visits a cherry bakewell factory where they produce 250,000 little tarts every day.

The Trappist-1 stellar system is home to seven Earth-like planets, and one of them could harbor life; rival teams of visionary pioneers use data to extrapolate entire worlds, leading the search for life on other planets throughout the universe.

A race to find the planet's 60 deadliest creatures.

A race to find the planet's 60 deadliest creatures.

Steve returns home to the Atlantic waters of the British Isles as he considers the question of what humanity can do to ensure the enduring future of whales.

Gregg Wallace is in Italy, hitching a lift on a train carrying over a thousand tons of wheat to the largest dried pasta factory in the world.

Gregg Wallace visits a cherry bakewell factory where they produce 250,000 little tarts every day.

After being raised on the ice in winter, emperor penguin chicks find themselves abandoned by their parents in spring; to survive, they must find their own way across the treacherous sea ice to the rich waters of the Southern Ocean.

David Attenborough reveals the life of the hippopotamus, an animal that cannot swim yet is utterly dependent on water, with incredible underwater footage.

Grasslands cover one quarter of all land and support the greatest gatherings of wildlife on Earth, but hostile seasons pose a survival risk.

Wonders created by the power of water include Victoria Falls, where men take risks to reach fishing pools; the Camargue, where a man duels with a bull; ocean reefs.

David Attenborough reveals the life of the hippopotamus, an animal that cannot swim yet is utterly dependent on water, with incredible underwater footage.

Grasslands cover one quarter of all land and support the greatest gatherings of wildlife on Earth, but hostile seasons pose a survival risk.

Wonders created by the power of water include Victoria Falls, where men take risks to reach fishing pools; the Camargue, where a man duels with a bull; ocean reefs.

Gregg Wallace visits a cherry bakewell factory where they produce 250,000 little tarts every day.

After being raised on the ice in winter, emperor penguin chicks find themselves abandoned by their parents in spring; to survive, they must find their own way across the treacherous sea ice to the rich waters of the Southern Ocean.

The Trappist-1 stellar system is home to seven Earth-like planets, and one of them could harbor life; rival teams of visionary pioneers use data to extrapolate entire worlds, leading the search for life on other planets throughout the universe.

Exploring Scandinavia's kingdoms of fire and ice and the animals - including muskoxen, polar bears and arctic foxes - who must navigate the landscape as it changes around them.

Valentines day at the rehab.

Exploring the landscape and archaeology of Alberta's foothills and badlands from Calgary to Drumheller.

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.

Hope scrambles to save the animals when a burglar busts down the door to the rehab, as the spring baby boom brings in a flood of injured and orphaned animals.

Exploring the frontier region of Saskatchewan from Cypress Hills Provincial Park to the open prairie lining the 49th parallel.

Drones reveal what's left of Henry Ford's American suburb in the Brazilian jungle; 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.

Emperor penguins cross a dangerous frozen sea to reach their breeding grounds; rockhoppers brave stormy seas and a 300-foot cliff; tropical humboldt penguins face sea lions and vampire bats as they make their way to their desert nests.

A day at the barbour factory shows how their weatherproof coats are waxed, stitched and riveted by a dedicated team at a rate of 650 jackets a day.

Hannah gains access to a top-secret site where anonymous staff and the latest tech work to make the British passport one of the most secure documents on the planet; she reveals the World War I spy craft hidden in the pages of every passport.

David Attenborough reveals the life of the hippopotamus, an animal that cannot swim yet is utterly dependent on water, with incredible underwater footage.

Grasslands cover one quarter of all land and support the greatest gatherings of wildlife on Earth, but hostile seasons pose a survival risk.

Wonders created by the power of water include Victoria Falls, where men take risks to reach fishing pools; the Camargue, where a man duels with a bull; ocean reefs.

A day at the barbour factory shows how their weatherproof coats are waxed, stitched and riveted by a dedicated team at a rate of 650 jackets a day.

The winter season grows more erratic, and Alaskans are forced to adapt.

As the deep cold persists, Alaskans must carry on their way of life.

Comedians Maisie Adam and Suzi Ruffell travel to Morocco and navigate North Africa's mountain passes, canyons and dunes in the heat en route to the Sahara.

In the Philippines, the Taal volcano violently erupts; a snowboarder in Utah rescues himself from a snowy mountain; in the Grand Canyon, mud and rocks barrel down on a group of tourists.

As the deep cold persists, Alaskans must carry on their way of life.

Comedians Maisie Adam and Suzi Ruffell travel to Morocco and navigate North Africa's mountain passes, canyons and dunes in the heat en route to the Sahara.

In the Philippines, the Taal volcano violently erupts; a snowboarder in Utah rescues himself from a snowy mountain; in the Grand Canyon, mud and rocks barrel down on a group of tourists.

A day at the barbour factory shows how their weatherproof coats are waxed, stitched and riveted by a dedicated team at a rate of 650 jackets a day.

At the top of the planet lies the Arctic Ocean; after four months of winter darkness, the sun returns to reveal a frozen ocean covered in ice; mother polar bears emerge from their hillside dens and lead their cubs down to the sea ice to hunt.

Hannah gains access to a top-secret site where anonymous staff and the latest tech work to make the British passport one of the most secure documents on the planet; she reveals the World War I spy craft hidden in the pages of every passport.

Emperor penguins cross a dangerous frozen sea to reach their breeding grounds; rockhoppers brave stormy seas and a 300-foot cliff; tropical humboldt penguins face sea lions and vampire bats as they make their way to their desert nests.

Hope fights to save a family of foxes; the nursery is hit by a mysterious outbreak.

Journey along the Manitoba-United States border's wide-open frontier with incredible landscapes and stories of human migration.

As seen from space, a crater in Turkmenistan, is on fire; drones reveal perfect circles in the Namibian desert; A puzzle is solved by a World War 2 code breaker; Mystery of Death Valley's self-moving stones; Utah's strange electric blue ponds.

Twin fawns arrive at the centre; a volunteer searches for orphans in the woods; Hope tends to a tiny owl.

An aerial journey along the shores of Lake Superior, exploring the city of Thunder Bay and the vast, natural wonders of the world's largest freshwater lake.

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 male penguins hand over their newborns to the returning females.

Host Gregg Wallace travels to the enormous Brioche Pasquier factory in France to find out the secrets to producing 336,000 croissants every day.

Hannah takes a look at the vacuum cleaner; she goes behind the scenes with Dyson and discovers how the motor in their latest vacuum spins nine times faster than that of a Formula One race car.

As the deep cold persists, Alaskans must carry on their way of life.

Comedians Maisie Adam and Suzi Ruffell travel to Morocco and navigate North Africa's mountain passes, canyons and dunes in the heat en route to the Sahara.

In the Philippines, the Taal volcano violently erupts; a snowboarder in Utah rescues himself from a snowy mountain; in the Grand Canyon, mud and rocks barrel down on a group of tourists.

Host Gregg Wallace travels to the enormous Brioche Pasquier factory in France to find out the secrets to producing 336,000 croissants every day.

Found on every continent, mountains create unique frozen worlds, home to extraordinary animals that must overcome the crushing conditions of the cold.

Many leading scientists believe there is a possibility of detecting the first evidence of extraterrestrial life.

The same 92 elements that exist on Earth can be found throughout the cosmos.

Tutankhamun's tomb was discovered in November 1922; since then, scientists and archaeologists have been puzzled by an iron dagger that was tucked in among the linen folds of the mummy.

Many leading scientists believe there is a possibility of detecting the first evidence of extraterrestrial life.

The same 92 elements that exist on Earth can be found throughout the cosmos.

Tutankhamun's tomb was discovered in November 1922; since then, scientists and archaeologists have been puzzled by an iron dagger that was tucked in among the linen folds of the mummy.

Host Gregg Wallace travels to the enormous Brioche Pasquier factory in France to find out the secrets to producing 336,000 croissants every day.

Found on every continent, mountains create unique frozen worlds, home to extraordinary animals that must overcome the crushing conditions of the cold.

Hannah takes a look at the vacuum cleaner; she goes behind the scenes with Dyson and discovers how the motor in their latest vacuum spins nine times faster than that of a Formula One race car.

The male penguins hand over their newborns to the returning females.

Exploring the history and landscape of the Lake Erie region, from Windsor and Detroit to the town of Port Dover and beyond.

It's officially the third-highest snowfall in Manitoba in the last century; commercial fishers are plagued by deep drifts and hidden pockets of slush that can stop them in their tracks; Chris finds out the hard way that traveling alone is a bad idea.

With less than a month left in the fishing season, all crews are desperate to catch their remaining quota, and failing to do so means leaving money on the table; Justin and Mike are fighting to hit their target.

Tempers flare as hunger, exhaustion, and no reprieve from one another pushes someone past the point of no return.

Michela, Brendan and Caleb struggle on the water as they make way to a new camp; a medicine woman brings the group knowledge and insights.

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; A giant, unusual pattern is discovered in the Nevada desert.

British comedian and travel enthusiast Griff Rhys Jones explores the prairies and vast sprawling plains of both Saskatchewan and Alberta provinces. He discovers that far from empty, they hide a diversity of riches, from ancient buffalo herds to dinosaur fossils and acres of cultivated farmland.

David Attenborough reveals the life of the hippopotamus, an animal that cannot swim yet is utterly dependent on water, with incredible underwater footage.

Winter is the greatest test for life in the polar regions; in the Arctic, a female polar bear treks into the mountains to give birth; out on the frozen ocean, the entire population of the world's spectacled eider ducks braves the winter.

A look at the extraordinary riches and wonders of the polar regions and the people that have been visiting them for thousands of years.

After being raised on the ice in winter, emperor penguin chicks find themselves abandoned by their parents in spring; to survive, they must find their own way across the treacherous sea ice to the rich waters of the Southern Ocean.

At the top of the planet lies the Arctic Ocean; after four months of winter darkness, the sun returns to reveal a frozen ocean covered in ice; mother polar bears emerge from their hillside dens and lead their cubs down to the sea ice to hunt.

Found on every continent, mountains create unique frozen worlds, home to extraordinary animals that must overcome the crushing conditions of the cold.

Gregg Wallace is in Italy, hitching a lift on a train carrying over a thousand tons of wheat to the largest dried pasta factory in the world.

In the planet's most densely populated continent, animals live at extremely close quarters with people, from tigers making a home in town to elephants stopping traffic for food.

Icy Antarctica is a land of survivors enduring the most hostile conditions on Earth.

Exploring powerful lightning, mountains with strange, metallic frosts and monsoon rains on a moon that is a billion miles away from Earth.

The team explores an area where no human has ever set foot, dropping nearly 400 meters into the deepest canyon in Oman in Southern Arabia.

Icy Antarctica is a land of survivors enduring the most hostile conditions on Earth.

Exploring powerful lightning, mountains with strange, metallic frosts and monsoon rains on a moon that is a billion miles away from Earth.

The team explores an area where no human has ever set foot, dropping nearly 400 meters into the deepest canyon in Oman in Southern Arabia.

From space, satellite cameras reveal that Earth is a kaleidoscope of color; turquoise plankton blooms trigger a feeding frenzy, China turns yellow with rapeseed flowers, and mysterious green lights appear in the ocean.

The Earth's surface is changing faster than ever in human history: cities grow, forests disappear and glaciers melt; a man feeds thousands of parakeets in a city; in Sumatra, a female orangutan and her daughter face life in a forest under threat.

The Trappist-1 stellar system is home to seven Earth-like planets, and one of them could harbor life; rival teams of visionary pioneers use data to extrapolate entire worlds, leading the search for life on other planets throughout the universe.

Hannah gains access to a top-secret site where anonymous staff and the latest tech work to make the British passport one of the most secure documents on the planet; she reveals the World War I spy craft hidden in the pages of every passport.

From high above, a view of Niagara Falls, Lake Ontario, the Greater Toronto Area and the wonders of Thousand Islands National Park.

All crews race toward the end of the season on March 31, desperate to make quota before they're forced off the ice; emotions run high as the Kristjanson crew surveys the damage and recovers what's left of Trevor's narrow gauge bomber.

Gros Morne National Park is the result of continental collision.

The adventurers move to a processing camp in an attempt to maximize the areas resources.

When the beaver pelts go missing, the group's only source of food is beaver jerky; Michela takes on too much maintaining the trap lines.

An enormous fiery vortex in Redding, California, the island nation of Malta loses a natural treasure, a mysterious radioactive hotspot is discovered near Chernobyl, and an unknown force lays waste to a mountain forest in Italian Alps.

Griff uncovers what it is about living in the Pacific Northwest that makes people strive for happiness and what he learned on his journey across Canada.

As the deep cold persists, Alaskans must carry on their way of life.

An illustration of how the Arctic springs to life after nearly seven months in total darkness.

Devon Island in Nunavut is the largest uninhabited island in the world; the icy landscape is so barren that NASA uses it to simulate conditions on Mars.

Inside the Mackenzie Delta, a transition zone of the boreal forest to the frozen tundra.

The people of Nunavik prepare for the coming winter.

Ninginganiq is so dangerous that even seasoned sailors keep away.

Wonders created by the power of water include Victoria Falls, where men take risks to reach fishing pools; the Camargue, where a man duels with a bull; ocean reefs.

Icy Antarctica is a land of survivors enduring the most hostile conditions on Earth.

In the heart of Asia lie vast arid lands; these deserts and dry grasslands are so hostile, they push life to the limit; the animals that live here are some of the toughest on earth - they are Asia's great survivors.

Focusing on faraway landscapes that are bursting with fire and ice; Professor Cox goes on a journey across the solar system for a look at volcanic eruptions so vast they reach into space; learning why these violent explosions hold the keys to life.

Grasslands cover one quarter of all land and support the greatest gatherings of wildlife on Earth, but hostile seasons pose a survival risk.

In the heart of Asia lie vast arid lands; these deserts and dry grasslands are so hostile, they push life to the limit; the animals that live here are some of the toughest on earth - they are Asia's great survivors.

Focusing on faraway landscapes that are bursting with fire and ice; Professor Cox goes on a journey across the solar system for a look at volcanic eruptions so vast they reach into space; learning why these violent explosions hold the keys to life.

Grasslands cover one quarter of all land and support the greatest gatherings of wildlife on Earth, but hostile seasons pose a survival risk.

An illustration of how the Arctic springs to life after nearly seven months in total darkness.

Devon Island in Nunavut is the largest uninhabited island in the world; the icy landscape is so barren that NASA uses it to simulate conditions on Mars.

Inside the Mackenzie Delta, a transition zone of the boreal forest to the frozen tundra.

The people of Nunavik prepare for the coming winter.

Lynn plays surrogate to baby beavers; Zach is forced to follow a seal along the coastline; a patient returns after a release goes wrong.

From high above Sault Ste. Marie, exploring the rugged Lake Huron coastline and scenic lakeside communities.

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.

Jennie and Stephanie try to save a harbour seal pup.

Exploring the history and landscape of the Lake Erie region, from Windsor and Detroit to the town of Port Dover and beyond.

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; A giant, unusual pattern is discovered in the Nevada desert.

The chicks are getting more independent.

Catch some zees after Gregg learns how a Leeds factory turns steel and natural fibres into 600 pocket-spring mattresses a day; optimize your nap habits with Cherry, look back on mattress history, and dive into our enduring love affair with duvets.

With over six billion of them across the planet, smartphones have changed the modern world; with rare access to electronics giant Samsung, Hannah uncovers the technological game changers that have made the smartphone a reality.

In the heart of Asia lie vast arid lands; these deserts and dry grasslands are so hostile, they push life to the limit; the animals that live here are some of the toughest on earth - they are Asia's great survivors.

Focusing on faraway landscapes that are bursting with fire and ice; Professor Cox goes on a journey across the solar system for a look at volcanic eruptions so vast they reach into space; learning why these violent explosions hold the keys to life.

The team explores an area where no human has ever set foot, dropping nearly 400 meters into the deepest canyon in Oman in Southern Arabia.

Catch some zees after Gregg learns how a Leeds factory turns steel and natural fibres into 600 pocket-spring mattresses a day; optimize your nap habits with Cherry, look back on mattress history, and dive into our enduring love affair with duvets.

Trekking across the planet's most hostile frozen zone: Antarctica; getting to know ice.