The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

Levison and Alberto travel through Guatemala, Honduras and Nicaragua.

A gripping journey through time unravels the hidden secrets of the Ice Age and how it created the world everyone lives in.

The St. Lawrence River is one that forged North America, allowing ships to traverse the continent; the adventure begins in Canada's first capital city of Kingston and near Canada's second-largest city of Montreal.

A new volunteer steps up to the challenge; Hope's first fawn of the year interrupts delicate surgery on an injured owl.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

A hurricane slams the rehab, knocking an osprey nest out of its tree; Hope scrambles to save the babies in the middle of the storm.

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.

From the icy peaks of age-old mountain glaciers to the fog-shrouded canopies of Canada's only rainforest, it's the wettest place in North America.

A hurricane slams the rehab, knocking an osprey nest out of its tree; Hope scrambles to save the babies in the middle of the storm.

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.

From the icy peaks of age-old mountain glaciers to the fog-shrouded canopies of Canada's only rainforest, it's the wettest place in North America.

A hurricane slams the rehab, knocking an osprey nest out of its tree; Hope scrambles to save the babies in the middle of the storm.

Navigating the historic Potomac River from West Virginia to Chesapeake Bay, passing through Washington, D.C. and the national monuments and ending at George Washington's Mount Vernon estate.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

Levison and Alberto travel through Guatemala, Honduras and Nicaragua.

A gripping journey through time unravels the hidden secrets of the Ice Age and how it created the world everyone lives in.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

Levison and Alberto travel through Guatemala, Honduras and Nicaragua.

A gripping journey through time unravels the hidden secrets of the Ice Age and how it created the world everyone lives in.

In the middle of the jungle in Borneo, Dr Ann Jones and a team of scientists search high and low for a mammal as big as a dog and covered in scales; one of the world's most trafficked animals: the weird and wonderful pangolin.

Dogs indeed account for more than half of the patients at Rocky Rapids Clinic; Dr. Savannah works tirelessly to keep rural Alberta's four-legged canine friends healthy and safe.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

With the waterways open, Alaskans navigate rivers for key resources.

In the middle of the jungle in Borneo, Dr Ann Jones and a team of scientists search high and low for a mammal as big as a dog and covered in scales; one of the world's most trafficked animals: the weird and wonderful pangolin.

Dogs indeed account for more than half of the patients at Rocky Rapids Clinic; Dr. Savannah works tirelessly to keep rural Alberta's four-legged canine friends healthy and safe.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

With the waterways open, Alaskans navigate rivers for key resources.

Navigating the historic Potomac River from West Virginia to Chesapeake Bay, passing through Washington, D.C. and the national monuments and ending at George Washington's Mount Vernon estate.

A hurricane slams the rehab, knocking an osprey nest out of its tree; Hope scrambles to save the babies in the middle of the storm.

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.

From the icy peaks of age-old mountain glaciers to the fog-shrouded canopies of Canada's only rainforest, it's the wettest place in North America.

The rehab is up all night with three tiny orphans needing round-the-clock care.

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.

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

The rehab is up all night with three tiny orphans needing round-the-clock care.

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.

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

The rehab is up all night with three tiny orphans needing round-the-clock care.

A journey down one of the wild rivers in the world, the Yukon; the unusual trip starts in an aircraft piloted by a painter and the odyssey ends with a visit to a graveyard of disintegrating rear-wheel steamers.

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

Get under the skin of ice age megabeasts as Steve tackles a murder mystery in a U.K. cave filled with oversized animal remains; discover the sabre-toothed tiger's strengths and weaknesses with Michaela; see what woolly mammoth DNA has to say.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

In the middle of the jungle in Borneo, Dr Ann Jones and a team of scientists search high and low for a mammal as big as a dog and covered in scales; one of the world's most trafficked animals: the weird and wonderful pangolin.

Dogs indeed account for more than half of the patients at Rocky Rapids Clinic; Dr. Savannah works tirelessly to keep rural Alberta's four-legged canine friends healthy and safe.

With the waterways open, Alaskans navigate rivers for key resources.

Dara's journey starts in Sicily, home to the mighty Mount Etna - Europe's largest volcano; a journey from Etna to Vesuvius to witness fearsome natural wonders.

Explaining how freshwater is the lifeblood of planet Earth and why animals depend on it for their survival.

The story of how plant life turned Earth from a barren rock into a vibrant green world; a four-billion year saga of highs and lows that almost wiped out all life on the planet.

Dara's journey starts in Sicily, home to the mighty Mount Etna - Europe's largest volcano; a journey from Etna to Vesuvius to witness fearsome natural wonders.

Explaining how freshwater is the lifeblood of planet Earth and why animals depend on it for their survival.

The story of how plant life turned Earth from a barren rock into a vibrant green world; a four-billion year saga of highs and lows that almost wiped out all life on the planet.

A journey down one of the wild rivers in the world, the Yukon; the unusual trip starts in an aircraft piloted by a painter and the odyssey ends with a visit to a graveyard of disintegrating rear-wheel steamers.

The rehab is up all night with three tiny orphans needing round-the-clock care.

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.

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

Pondering a doe's potential as a surrogate mother and the chances that two fawns have in the ER.

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.

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

Pondering a doe's potential as a surrogate mother and the chances that two fawns have in the ER.

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.

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

Pondering a doe's potential as a surrogate mother and the chances that two fawns have in the ER.

Meandering through the black waters of a primordial river immortalized in a folk song.

Dara's journey starts in Sicily, home to the mighty Mount Etna - Europe's largest volcano; a journey from Etna to Vesuvius to witness fearsome natural wonders.

Explaining how freshwater is the lifeblood of planet Earth and why animals depend on it for their survival.

The story of how plant life turned Earth from a barren rock into a vibrant green world; a four-billion year saga of highs and lows that almost wiped out all life on the planet.

Dara's journey starts in Sicily, home to the mighty Mount Etna - Europe's largest volcano; a journey from Etna to Vesuvius to witness fearsome natural wonders.

Explaining how freshwater is the lifeblood of planet Earth and why animals depend on it for their survival.

The story of how plant life turned Earth from a barren rock into a vibrant green world; a four-billion year saga of highs and lows that almost wiped out all life on the planet.

Simon revisits the incredible characters he's met during his travels.

Battle your way through Earth's second-greatest rainforest; follow Simon across 500 miles of dense tropical jungle full of biting insects and peat bogs to reach the Salonga region; enjoy an emotional encounter with a group of wild bonobos.

Simon travels through Brazil, from the heart of the Amazon to the city of Rio de Janeiro.

Simon revisits the incredible characters he's met during his travels.

Battle your way through Earth's second-greatest rainforest; follow Simon across 500 miles of dense tropical jungle full of biting insects and peat bogs to reach the Salonga region; enjoy an emotional encounter with a group of wild bonobos.

Simon travels through Brazil, from the heart of the Amazon to the city of Rio de Janeiro.

Meandering through the black waters of a primordial river immortalized in a folk song.

Pondering a doe's potential as a surrogate mother and the chances that two fawns have in the ER.

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.

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

Two tricky patients finally go free; 50 babies are born all at once.

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

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.

Two tricky patients finally go free; 50 babies are born all at once.

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

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.

Two tricky patients finally go free; 50 babies are born all at once.

A journey on Scotland's River Spey, traveling from its source in the Highlands, winding by boat through the mountains to where the river meets the North Sea.

Simon revisits the incredible characters he's met during his travels.

Battle your way through Earth's second-greatest rainforest; follow Simon across 500 miles of dense tropical jungle full of biting insects and peat bogs to reach the Salonga region; enjoy an emotional encounter with a group of wild bonobos.

Simon travels through Brazil, from the heart of the Amazon to the city of Rio de Janeiro.

Simon revisits the incredible characters he's met during his travels.

Battle your way through Earth's second-greatest rainforest; follow Simon across 500 miles of dense tropical jungle full of biting insects and peat bogs to reach the Salonga region; enjoy an emotional encounter with a group of wild bonobos.

Simon travels through Brazil, from the heart of the Amazon to the city of Rio de Janeiro.

In 1996, NASA scientists made a shocking announcement; they claimed they had found evidence of alien life in a meteorite from Mars. This film tackles one of the biggest questions in science - whether there is, or ever was, life on Mars.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

In an attempt to view the cosmos beyond the scope of human vision, infrared light and gamma radiation are used.

Advanced telescopes capture images of the night sky from the Atacama Desert.

In 1996, NASA scientists made a shocking announcement; they claimed they had found evidence of alien life in a meteorite from Mars. This film tackles one of the biggest questions in science - whether there is, or ever was, life on Mars.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

In an attempt to view the cosmos beyond the scope of human vision, infrared light and gamma radiation are used.

Advanced telescopes capture images of the night sky from the Atacama Desert.

A journey on Scotland's River Spey, traveling from its source in the Highlands, winding by boat through the mountains to where the river meets the North Sea.

Two tricky patients finally go free; 50 babies are born all at once.

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

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 and Dr. Barry break ground on new chapters in their life, Hope rebuilding the rehab and Dr. Barry setting out on his own.

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.

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

Hope and Dr. Barry break ground on new chapters in their life, Hope rebuilding the rehab and Dr. Barry setting out on his own.

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.

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

Hope and Dr. Barry break ground on new chapters in their life, Hope rebuilding the rehab and Dr. Barry setting out on his own.

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.

In 1996, NASA scientists made a shocking announcement; they claimed they had found evidence of alien life in a meteorite from Mars. This film tackles one of the biggest questions in science - whether there is, or ever was, life on Mars.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

In an attempt to view the cosmos beyond the scope of human vision, infrared light and gamma radiation are used.

Advanced telescopes capture images of the night sky from the Atacama Desert.

In 1996, NASA scientists made a shocking announcement; they claimed they had found evidence of alien life in a meteorite from Mars. This film tackles one of the biggest questions in science - whether there is, or ever was, life on Mars.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

In an attempt to view the cosmos beyond the scope of human vision, infrared light and gamma radiation are used.

Coming face to face with the scientists bearing witness to history's profound climate shift; pondering the effect these changes have on Earth's human and animal communities, mapping the destruction from space and learning how to save the planet.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

Kayaking the white water of the Russian peninsula of Kamchatka; examining brown bears in the wilderness.

Coming face to face with the scientists bearing witness to history's profound climate shift; pondering the effect these changes have on Earth's human and animal communities, mapping the destruction from space and learning how to save the planet.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

Kayaking the white water of the Russian peninsula of Kamchatka; examining brown bears in the wilderness.

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.

Hope and Dr. Barry break ground on new chapters in their life, Hope rebuilding the rehab and Dr. Barry setting out on his own.

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.

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

Hope's open house is bigger than ever; a mysterious visitor leaves a big impression.

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.

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

Hope's open house is bigger than ever; a mysterious visitor leaves a big impression.

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.

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

Hope's open house is bigger than ever; a mysterious visitor leaves a big impression.

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.

Coming face to face with the scientists bearing witness to history's profound climate shift; pondering the effect these changes have on Earth's human and animal communities, mapping the destruction from space and learning how to save the planet.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

Kayaking the white water of the Russian peninsula of Kamchatka; examining brown bears in the wilderness.

Coming face to face with the scientists bearing witness to history's profound climate shift; pondering the effect these changes have on Earth's human and animal communities, mapping the destruction from space and learning how to save the planet.

In the middle of the jungle in Borneo, Dr Ann Jones and a team of scientists search high and low for a mammal as big as a dog and covered in scales; one of the world's most trafficked animals: the weird and wonderful pangolin.

Kayaking the white water of the Russian peninsula of Kamchatka; examining brown bears in the wilderness.

Global conservationist Dr. M Sanjayan is in California, as it suffers the longest dry period in a thousand years.

Olimba struggles with old age, and the wild dog story takes an unexpected turn; the lions and the hyenas both enjoy a baby boom - but who has the power to rule?

With the waterways open, Alaskans navigate rivers for key resources.

Global conservationist Dr. M Sanjayan is in California, as it suffers the longest dry period in a thousand years.

Olimba struggles with old age, and the wild dog story takes an unexpected turn; the lions and the hyenas both enjoy a baby boom - but who has the power to rule?

With the waterways open, Alaskans navigate rivers for key resources.

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.

Hope's open house is bigger than ever; a mysterious visitor leaves a big impression.

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.

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

Endangered bats need Hope's help, but it means taking unusual steps; Hope's deer release has a bumpy start.

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

Endangered bats need Hope's help, but it means taking unusual steps; Hope's deer release has a bumpy start.

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

Endangered bats need Hope's help, but it means taking unusual steps; Hope's deer release has a bumpy start.

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.

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

Global conservationist Dr. M Sanjayan is in California, as it suffers the longest dry period in a thousand years.

Olimba struggles with old age, and the wild dog story takes an unexpected turn; the lions and the hyenas both enjoy a baby boom - but who has the power to rule?

Endangered bats need Hope's help, but it means taking unusual steps; Hope's deer release has a bumpy start.

Global conservationist Dr. M Sanjayan is in California, as it suffers the longest dry period in a thousand years.

Olimba struggles with old age, and the wild dog story takes an unexpected turn; the lions and the hyenas both enjoy a baby boom - but who has the power to rule?

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Steve and Michaela uncover the story of Neanderthals versus Homo sapiens and their struggle to survive.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

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

Global conservationist Dr. M Sanjayan is in California, as it suffers the longest dry period in a thousand years.

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

The worst winter in 100 years causes big problems.

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.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

The worst winter in 100 years causes big problems.

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.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

The worst winter in 100 years causes big problems.

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

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

Exploring fossils from a North Dakota site that may reveal what happened when an asteroid struck Earth and wiped out the dinosaurs.

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.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Steve and Michaela uncover the story of Neanderthals versus Homo sapiens and their struggle to survive.

In northern Queensland, nature nerd Ann Jones comes face to face with one of Australia's mightiest predators, the bull shark; she discovers there's much more to them than meets the eye.

How humans discovered the planets and how they became a complex solar system.

The earth is a machine with its moving parts buried deep beyond our sight; revealing what is beneath our feet.

A journey from the heat of the tropics to the planet's frozen poles; life has spread to almost every part of the ocean, but there are many different worlds within it and each presents unique challenges.

In northern Queensland, nature nerd Ann Jones comes face to face with one of Australia's mightiest predators, the bull shark; she discovers there's much more to them than meets the eye.

How humans discovered the planets and how they became a complex solar system.

The earth is a machine with its moving parts buried deep beyond our sight; revealing what is beneath our feet.

A journey from the heat of the tropics to the planet's frozen poles; life has spread to almost every part of the ocean, but there are many different worlds within it and each presents unique challenges.

In northern Queensland, nature nerd Ann Jones comes face to face with one of Australia's mightiest predators, the bull shark; she discovers there's much more to them than meets the eye.

How humans discovered the planets and how they became a complex solar system.

The earth is a machine with its moving parts buried deep beyond our sight; revealing what is beneath our feet.

A journey from the heat of the tropics to the planet's frozen poles; life has spread to almost every part of the ocean, but there are many different worlds within it and each presents unique challenges.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

A hare needs help; Chelsea rescues a litter of orphaned foxes; Dr. Barry helps an injured bobcat.

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.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

A hare needs help; Chelsea rescues a litter of orphaned foxes; Dr. Barry helps an injured bobcat.

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.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

A hare needs help; Chelsea rescues a litter of orphaned foxes; Dr. Barry helps an injured bobcat.

After tough early months, the penguin chicks are becoming more independent and are often left behind as their parents fish; follow along as they leave the security of home to return many years later to the same spot to breed.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

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

In northern Queensland, nature nerd Ann Jones comes face to face with one of Australia's mightiest predators, the bull shark; she discovers there's much more to them than meets the eye.

How humans discovered the planets and how they became a complex solar system.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

A journey from the heat of the tropics to the planet's frozen poles; life has spread to almost every part of the ocean, but there are many different worlds within it and each presents unique challenges.

In Naples, Dara explores the story of Mount Vesuvius and its 79AD eruption.

Sir David Attenborough explores the dangerous frontiers created by the world's coasts, where animals fight for survival amid constant change; there are some unexpected residents on Namibia's Skeleton Coast.

From Sydney to the Greater Blue Mountains, Zach and Darin meet with leading eco-warriors to learn about protected lands and habitat conservation.

In Naples, Dara explores the story of Mount Vesuvius and its 79AD eruption.

Sir David Attenborough explores the dangerous frontiers created by the world's coasts, where animals fight for survival amid constant change; there are some unexpected residents on Namibia's Skeleton Coast.

From Sydney to the Greater Blue Mountains, Zach and Darin meet with leading eco-warriors to learn about protected lands and habitat conservation.

In Naples, Dara explores the story of Mount Vesuvius and its 79AD eruption.

Sir David Attenborough explores the dangerous frontiers created by the world's coasts, where animals fight for survival amid constant change; there are some unexpected residents on Namibia's Skeleton Coast.

From Sydney to the Greater Blue Mountains, Zach and Darin meet with leading eco-warriors to learn about protected lands and habitat conservation.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

Hope's team build a special flight tent for a lone bat; a young porcupine arrives at the rehab; a stranded seal is rescued.

Examine mysterious holes in Israel; explore a ghost village hidden in the Colombian jungle, a shipwreck off the coast of Sri Lanka and a gutted airplane fuselage abandoned in Iceland.

From the icy peaks of age-old mountain glaciers to the fog-shrouded canopies of Canada's only rainforest, it's the wettest place in North America.

Hope's team build a special flight tent for a lone bat; a young porcupine arrives at the rehab; a stranded seal is rescued.

Examine mysterious holes in Israel; explore a ghost village hidden in the Colombian jungle, a shipwreck off the coast of Sri Lanka and a gutted airplane fuselage abandoned in Iceland.

From the icy peaks of age-old mountain glaciers to the fog-shrouded canopies of Canada's only rainforest, it's the wettest place in North America.

Hope's team build a special flight tent for a lone bat; a young porcupine arrives at the rehab; a stranded seal is rescued.

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

Steve and Michaela uncover the story of Neanderthals versus Homo sapiens and their struggle to survive.

Exploring fossils from a North Dakota site that may reveal what happened when an asteroid struck Earth and wiped out the dinosaurs.

After tough early months, the penguin chicks are becoming more independent and are often left behind as their parents fish; follow along as they leave the security of home to return many years later to the same spot to breed.

In Naples, Dara explores the story of Mount Vesuvius and its 79AD eruption.