In Alaska, preparation is key, when winter is around the corner.

Discovering how the moon shapes life on Earth.

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.

In Alaska, preparation is key, when winter is around the corner.

Hope puts everything on the line to save an orphaned black bear cub; two bobcats are ready for release, but they won't go easy.

Take a deep dive into watery enigmas; glide over a sunken Italian city; a unique underwater cemetery in the Florida Keys; a yellow brick road to nowhere in the depths of the North Pacific; puzzling rocky constructions off the coast of Australia.

Costa Rica is a world of its own; a tropical corridor squeezed between two great oceans, powered by rivers and volcanoes; its volcanoes erupt and deposit minerals into the soil, making the land fertile and creating the country's rich bio-diversity.

Hope puts everything on the line to save an orphaned black bear cub; two bobcats are ready for release, but they won't go easy.

Take a deep dive into watery enigmas; glide over a sunken Italian city; a unique underwater cemetery in the Florida Keys; a yellow brick road to nowhere in the depths of the North Pacific; puzzling rocky constructions off the coast of Australia.

Costa Rica is a world of its own; a tropical corridor squeezed between two great oceans, powered by rivers and volcanoes; its volcanoes erupt and deposit minerals into the soil, making the land fertile and creating the country's rich bio-diversity.

Hope puts everything on the line to save an orphaned black bear cub; two bobcats are ready for release, but they won't go easy.

Sue gets sidelined by technical issues; the Hailstones buckle down in the face of mother nature; Jessie and Glen find food and resources.

Brian explores the sun's rule over every world in the solar system.

Alaskans are forced to embrace their inner warrior as winter deepens.

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.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

Sue gets sidelined by technical issues; the Hailstones buckle down in the face of mother nature; Jessie and Glen find food and resources.

Journey from the lava ramparts to its fiery heart, discovering how this place became one of the most important areas of biodiversity in the world.

Brian explores the sun's rule over every world in the solar system.

Without volcanoes, life on Earth would never have begun; they are responsible for both the planet's breathable atmosphere and the oceans; mineral-rich ash from regular eruptions fertilize the land.

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

Brian explores the sun's rule over every world in the solar system.

Without volcanoes, life on Earth would never have begun; they are responsible for both the planet's breathable atmosphere and the oceans; mineral-rich ash from regular eruptions fertilize the land.

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

Sue gets sidelined by technical issues; the Hailstones buckle down in the face of mother nature; Jessie and Glen find food and resources.

Brian explores the sun's rule over every world in the solar system.

Journey from the lava ramparts to its fiery heart, discovering how this place became one of the most important areas of biodiversity in the world.

Sue gets sidelined by technical issues; the Hailstones buckle down in the face of mother nature; Jessie and Glen find food and resources.

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.

The differences between the Northern and Southern Rockies.

Explores strongholds abandoned by their architects; a lost city in the Amazon jungle; a desert fortress made by humanity's most notorious empire; explores a city of identical castles; examines a Greek isle's bloody history from the air.

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.

The jungle, underwater caves and lush everglades of the Yucatan shelter Mexico's largest predator, Morelet's crocodile.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

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.

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

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.

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.

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

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 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.

Exploring the hostile world of the desert and how plants survive by using weapons, camouflage and surprising alliances with animals.

Professor Brian Cox explores the solar system's frozen worlds; he meets the dwarf planet where mountains of solid ice float across the surface, the black and white moon painted with frost and a world illuminated by a strange form of ice.

Steve heads into Yucatan, Mexico, on the trail of the ancient Maya, uncovering secrets and artifacts.

Exploring the hostile world of the desert and how plants survive by using weapons, camouflage and surprising alliances with animals.

Steve goes in search of ocean acrobats, mischievous coyotes and deadlies in miniature; he ends up having an encounter with a humpback whale that he will never forget.

Steve heads into Yucatan, Mexico, on the trail of the ancient Maya, uncovering secrets and artifacts.

Exploring the hostile world of the desert and how plants survive by using weapons, camouflage and surprising alliances with animals.

Brian explores the sun's rule over every world in the solar system.

Without volcanoes, life on Earth would never have begun; they are responsible for both the planet's breathable atmosphere and the oceans; mineral-rich ash from regular eruptions fertilize the land.

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

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.

Scientists postulate that Earth was once sheathed in ice and complex animals evolved when the planet thawed, due to the release of carbon dioxide.

Peek at landmarks in places where they shouldn't be; wing your way over an imperial pyramid in the Netherlands, a metal sphere in remote Russia, a lion shape carved into an English hillside and a bare swath cut through an Austrian forest.

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.

In the heart of central Mexico, lies Sierra Gorda, a region that is home to bobcats, pumas and flying squirrels.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

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.

With scientists sending space probes to the furthest reaches of the solar system and beyond, the scientific search for alien life has begun; inspired by a childhood love of science fiction, Brian still hopes to hear from ET.

Brian takes a fresh look at the astonishing concept of gravity.

Brian explores one of the greatest mysteries in physics: time.

Brian questions how far humans will go in their exploration of the cosmos.

With scientists sending space probes to the furthest reaches of the solar system and beyond, the scientific search for alien life has begun; inspired by a childhood love of science fiction, Brian still hopes to hear from ET.

Brian takes a fresh look at the astonishing concept of gravity.

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 Gobi Desert, Gordon must gain his camel's trust to survive and find the Gobi bear.

Professor Brian Cox traces the development of the four rocky worlds closest to the sun: Mercury, Venus, Earth and Mars; born together, they battled the unbelievable violence of the early solar system to become stable planets.

Animals fight to survive extremes, from tundra to deserts, mountain summits to deep underground.

In the Gobi Desert, Gordon must gain his camel's trust to survive and find the Gobi bear.

Professor Brian Cox traces the development of the four rocky worlds closest to the sun: Mercury, Venus, Earth and Mars; born together, they battled the unbelievable violence of the early solar system to become stable planets.

Animals fight to survive extremes, from tundra to deserts, mountain summits to deep underground.

In the Gobi Desert, Gordon must gain his camel's trust to survive and find the Gobi bear.

Summer's onslaught of hunting and fishing prospects leads to hard work and unforeseen challenges.

In Alaska, preparation is key, when winter is around the corner.

Sue gets sidelined by technical issues; the Hailstones buckle down in the face of mother nature; Jessie and Glen find food and resources.

When a great horned owl arrives covered in oil, Doctor Sherri must put it through a terrifying, life-saving procedure; boxes of young foxes need help and attention.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

How the earth's atmosphere came to be; the one man to have braved the atmosphere's upper reaches and survived.

When a great horned owl arrives covered in oil, Doctor Sherri must put it through a terrifying, life-saving procedure; boxes of young foxes need help and attention.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

The search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

When a great horned owl arrives covered in oil, Doctor Sherri must put it through a terrifying, life-saving procedure; boxes of young foxes need help and attention.

Alaskans move into high gear to stock up for the winter months.

How Earth's cosmic backyard emerged from chaotic clouds of gas; two extraordinary wonders 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.

In the Gobi Desert, Gordon must gain his camel's trust to survive and find the Gobi bear.

Steve heads into Yucatan, Mexico, on the trail of the ancient Maya, uncovering secrets and artifacts.

Alaskans move into high gear to stock up for the winter months.

At the far tip of South America lies a magical realm that seems frozen in time; known as "the end of the world", this is Patagonia.

Eco-innovators introduce Zac and Darin to unique and cost-effective ways to address complex problems and help heal the environment.

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

Five months and more than 2000 miles into his journey, Lev is in Sudan, facing his biggest physical obstacle yet: the Sahara desert; he has to walk 1300 miles across one of the most inhospitable places on Earth.

Eco-innovators introduce Zac and Darin to unique and cost-effective ways to address complex problems and help heal the environment.

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

Five months and more than 2000 miles into his journey, Lev is in Sudan, facing his biggest physical obstacle yet: the Sahara desert; he has to walk 1300 miles across one of the most inhospitable places on Earth.

Alaskans move into high gear to stock up for the winter months.

How Earth's cosmic backyard emerged from chaotic clouds of gas; two extraordinary wonders on Earth.

At the far tip of South America lies a magical realm that seems frozen in time; known as "the end of the world", this is Patagonia.

Alaskans move into high gear to stock up for the winter months.

Hope's team struggles to help two rescued harp seals learn the natural behaviors they will need to survive in the wild.

Learning why an important urban center is sinking toward oblivion; soaring over sprawling ruins buried under Saharan sands; learning the modern secret of an ancient fortress; eyeing a ghost town on the edge of the Gobi.

The search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

Hope's team struggles to help two rescued harp seals learn the natural behaviors they will need to survive in the wild.

Learning why an important urban center is sinking toward oblivion; soaring over sprawling ruins buried under Saharan sands; learning the modern secret of an ancient fortress; eyeing a ghost town on the edge of the Gobi.

The search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

Hope's team struggles to help two rescued harp seals learn the natural behaviors they will need to survive in the wild.

Alaskans have to divide and conquer to stockpile resources for the long winter ahead.

Brian reveals how the atmosphere can create most of the wonderful sights in the solar system.

Eco-innovators introduce Zac and Darin to unique and cost-effective ways to address complex problems and help heal the environment.

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

Five months and more than 2000 miles into his journey, Lev is in Sudan, facing his biggest physical obstacle yet: the Sahara desert; he has to walk 1300 miles across one of the most inhospitable places on Earth.

Alaskans have to divide and conquer to stockpile resources for the long winter ahead.

In southeast Alaska, there's an ice-bound Eden that harbors possibly the richest temperate rainforests of all.

Steve Backshall is in Sydney, Australia, searching for the world's most venomous spider, the fastest striking snake and an ocean dragon that is a camouflaged assassin.

Orphaned baby rhinos in South Africa; how the deadly predators are tracked; what can be done to save the species from being poached to extinction.

A fishing crew takes on an adrenaline-filled fishing trip to Norway.

In the Gobi Desert, Gordon must gain his camel's trust to survive and find the Gobi bear.

Steve Backshall is in Sydney, Australia, searching for the world's most venomous spider, the fastest striking snake and an ocean dragon that is a camouflaged assassin.

Orphaned baby rhinos in South Africa; how the deadly predators are tracked; what can be done to save the species from being poached to extinction.

A fishing crew takes on an adrenaline-filled fishing trip to Norway.

In the Gobi Desert, Gordon must gain his camel's trust to survive and find the Gobi bear.

Alaskans have to divide and conquer to stockpile resources for the long winter ahead.

Brian reveals how the atmosphere can create most of the wonderful sights in the solar system.

In southeast Alaska, there's an ice-bound Eden that harbors possibly the richest temperate rainforests of all.

Alaskans have to divide and conquer to stockpile resources for the long winter ahead.

When a tiny piece of trash ruins a raccoon's life, Doctor Jessica cuts it free, but Hope faces tough decisions about its future; a volunteer plunges in to save an injured goose.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

Iceland is the world's largest volcanic island and new ground is born daily.

When a tiny piece of trash ruins a raccoon's life, Doctor Jessica cuts it free, but Hope faces tough decisions about its future; a volunteer plunges in to save an injured goose.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

Iceland is the world's largest volcanic island and new ground is born daily.

When a tiny piece of trash ruins a raccoon's life, Doctor Jessica cuts it free, but Hope faces tough decisions about its future; a volunteer plunges in to save an injured goose.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

Brian examines the universal laws of nature; planet size can make a difference between life and death.

Steve Backshall is in Sydney, Australia, searching for the world's most venomous spider, the fastest striking snake and an ocean dragon that is a camouflaged assassin.

Orphaned baby rhinos in South Africa; how the deadly predators are tracked; what can be done to save the species from being poached to extinction.

A fishing crew takes on an adrenaline-filled fishing trip to Norway.

In the Gobi Desert, Gordon must gain his camel's trust to survive and find the Gobi bear.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

Asia has the longest coastline of any continent, rich coral reefs, and never-seen-before animal behavior; exploring Asia's diverse waters.

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

Questions about how animals adapt to the worlds built by the planet's most invasive species, humans; a search for loot to steal with macaques in Bali; hunting for easy eats with bears in Lake Tahoe; whale poo help fish populations bounce back.

Exploring the worst mass extinction the planet has ever seen, when as much as 90% of all species died 252 million years ago; this moment in Earth's history took life to the brink, wreaking havoc and destruction on an unprecedented scale.

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

Questions about how animals adapt to the worlds built by the planet's most invasive species, humans; a search for loot to steal with macaques in Bali; hunting for easy eats with bears in Lake Tahoe; whale poo help fish populations bounce back.

Exploring the worst mass extinction the planet has ever seen, when as much as 90% of all species died 252 million years ago; this moment in Earth's history took life to the brink, wreaking havoc and destruction on an unprecedented scale.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

Brian examines the universal laws of nature; planet size can make a difference between life and death.

Asia has the longest coastline of any continent, rich coral reefs, and never-seen-before animal behavior; exploring Asia's diverse waters.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

When a tiny fawn gets hit by a car, Doctor Jessica must splint its broken leg or it will never return to the wild; a mother porcupine arrives with baby in tow and both need life-saving attention for a parasitic infection.

Witness 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 U.S. porcine stampede; confront top ocean predators on the Florida coast.

Iceland's volcanoes generate one third of earth's land-based lava, but the land was sculpted by ice.

When a tiny fawn gets hit by a car, Doctor Jessica must splint its broken leg or it will never return to the wild; a mother porcupine arrives with baby in tow and both need life-saving attention for a parasitic infection.

Witness 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 U.S. porcine stampede; confront top ocean predators on the Florida coast.

Iceland's volcanoes generate one third of earth's land-based lava, but the land was sculpted by ice.

When a tiny fawn gets hit by a car, Doctor Jessica must splint its broken leg or it will never return to the wild; a mother porcupine arrives with baby in tow and both need life-saving attention for a parasitic infection.

Alaskans get a brief respite from winter's fury with the end of the thaw.

After Brian explores the bottom of the ocean, he looks to the Solar System to see if there might be other worlds that could harbor life.

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

Questions about how animals adapt to the worlds built by the planet's most invasive species, humans; a search for loot to steal with macaques in Bali; hunting for easy eats with bears in Lake Tahoe; whale poo help fish populations bounce back.

Exploring the worst mass extinction the planet has ever seen, when as much as 90% of all species died 252 million years ago; this moment in Earth's history took life to the brink, wreaking havoc and destruction on an unprecedented scale.

Alaskans get a brief respite from winter's fury with the end of the thaw.

A fishing crew takes on an adrenaline-filled fishing trip to Norway.

Alaskans soldier through the heart of dark winter in pursuit of the resources they desperately need for survival.

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.

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

Alaskans soldier through the heart of dark winter in pursuit of the resources they desperately need for survival.

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.

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

Alaskans get a brief respite from winter's fury with the end of the thaw.

After Brian explores the bottom of the ocean, he looks to the Solar System to see if there might be other worlds that could harbor life.

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.

Alaskans get a brief respite from winter's fury with the end of the thaw.

Just as Hope is scrambling to get ready for her busiest day of the year, the government decides to seize the bear cub Hope's worked so hard to save.

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 highest tides in the world are found in the Bay of Fundy on Canada's east coast.

Just as Hope is scrambling to get ready for her busiest day of the year, the government decides to seize the bear cub Hope's worked so hard to save.

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 highest tides in the world are found in the Bay of Fundy on Canada's east coast.

Just as Hope is scrambling to get ready for her busiest day of the year, the government decides to seize the bear cub Hope's worked so hard to save.

Winter bears down on Alaskans, who make last-minute preparations for the return of the freeze.

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.

Alaskans soldier through the heart of dark winter in pursuit of the resources they desperately need for survival.

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.

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

Winter bears down on Alaskans, who make last-minute preparations for the return of the freeze.

Asia is the most mountainous continent on earth; from the tropical south to its barren centre, its highest places are home to some of our planet's most remarkable wildlife.

How Earth's cosmic backyard emerged from chaotic clouds of gas; two extraordinary wonders on Earth.

How wildlife adapts for survival to the seasonal shifts in the sun's intensity, from wood frogs that can freeze and thaw to Arctic wolves that thrive in the chilly darkness.

The 50th anniversary of the Apollo 11 moon landing in the place where it all began; physicist Dr. Brian Cox and host Dara Ó Briain travel to Cape Canaveral, Fla., for a look inside the historic mission and the future of space exploration.

How wildlife adapts for survival to the seasonal shifts in the sun's intensity, from wood frogs that can freeze and thaw to Arctic wolves that thrive in the chilly darkness.

The 50th anniversary of the Apollo 11 moon landing in the place where it all began; physicist Dr. Brian Cox and host Dara Ó Briain travel to Cape Canaveral, Fla., for a look inside the historic mission and the future of space exploration.

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.

Asia is the most mountainous continent on earth; from the tropical south to its barren centre, its highest places are home to some of our planet's most remarkable wildlife.

Winter bears down on Alaskans, who make last-minute preparations for the return of the freeze.

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.

How the earth's atmosphere came to be; the one man to have braved the atmosphere's upper reaches and survived.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

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.

Iceland is the world's largest volcanic island and new ground is born daily.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

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.

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

At the far tip of South America lies a magical realm that seems frozen in time; known as "the end of the world", this is Patagonia.

In southeast Alaska, there's an ice-bound Eden that harbors possibly the richest temperate rainforests of all.

Asia has the longest coastline of any continent, rich coral reefs, and never-seen-before animal behavior; exploring Asia's diverse waters.

Asia is the most mountainous continent on earth; from the tropical south to its barren centre, its highest places are home to some of our planet's most remarkable wildlife.

How Earth's cosmic backyard emerged from chaotic clouds of gas; two extraordinary wonders on Earth.

Alaskans soldier through the heart of dark winter in pursuit of the resources they desperately need for survival.

David Attenborough explains how humans help plants that are facing extinction, from projects in Africa to re-seeding the landscape to rebuilding a Brazilian rainforest tree.

Brian journeys across the solar system and explores its weirdest worlds, the misfits and oddballs; he discovers the forces that sculpted bizarre features and strange phenomena.

Traveling from the frigid, icy waters of Alaska to the balmy, serene seas of the tropics; seeing how varied shark species really are; getting insight into their lives, learning why these endangered creatures are not monsters at all.

David Attenborough explains how humans help plants that are facing extinction, from projects in Africa to re-seeding the landscape to rebuilding a Brazilian rainforest tree.

Steve Backshall is in Sydney, Australia, searching for the world's most venomous spider, the fastest striking snake and an ocean dragon that is a camouflaged assassin.

Traveling from the frigid, icy waters of Alaska to the balmy, serene seas of the tropics; seeing how varied shark species really are; getting insight into their lives, learning why these endangered creatures are not monsters at all.

David Attenborough explains how humans help plants that are facing extinction, from projects in Africa to re-seeding the landscape to rebuilding a Brazilian rainforest tree.

How Earth's cosmic backyard emerged from chaotic clouds of gas; two extraordinary wonders on Earth.

The 50th anniversary of the Apollo 11 moon landing in the place where it all began; physicist Dr. Brian Cox and host Dara Ó Briain travel to Cape Canaveral, Fla., for a look inside the historic mission and the future of space exploration.

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

The search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

Learning why an important urban center is sinking toward oblivion; soaring over sprawling ruins buried under Saharan sands; learning the modern secret of an ancient fortress; eyeing a ghost town on the edge of the Gobi.

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

Iceland's volcanoes generate one third of earth's land-based lava, but the land was sculpted by ice.

Witness 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 U.S. porcine stampede; confront top ocean predators on the Florida coast.

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

How Earth's cosmic backyard emerged from chaotic clouds of gas; two extraordinary wonders on Earth.

How wildlife adapts for survival to the seasonal shifts in the sun's intensity, from wood frogs that can freeze and thaw to Arctic wolves that thrive in the chilly darkness.

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

Five months and more than 2000 miles into his journey, Lev is in Sudan, facing his biggest physical obstacle yet: the Sahara desert; he has to walk 1300 miles across one of the most inhospitable places on Earth.

Winter bears down on Alaskans, who make last-minute preparations for the return of the freeze.

Steve Backshall is in Sydney, Australia, searching for the world's most venomous spider, the fastest striking snake and an ocean dragon that is a camouflaged assassin.

Orphaned baby rhinos in South Africa; how the deadly predators are tracked; what can be done to save the species from being poached to extinction.