BBC Earth

Hannah goes behind the scenes to look at the technology behind the lift; along the way, she finds out how coal mines made lifts safer, gets to grips with a piece of medieval siege technology and discovers how a PR stunt changed the modern skyline.

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.

A hundred days without sunlight approach; Glenn needs to retrieve more wood for heat; Andy and Kate rescue a bear cub; the Hailstones gather resources for themselves and their neighbors; Sue has a long list to complete.

Hope and Barry travel to Texas where not everyone agrees on how to help wildlife.

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.

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

Hope and Barry travel to Texas where not everyone agrees on how to help wildlife.

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.

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

Hope and Barry travel to Texas where not everyone agrees on how to help wildlife.

Dark winter brings new challenges in sub-zero temperatures; Andy maintains snow-covered trails; Sue fixes her generator; the Hailstones build a new teepee; Erik takes his wife hunting.

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.

In the aftermath of a devastating bushfire season, Zac and Darin learn about efforts to rehabilitate the wildlife and livestock population.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Levison begins his journey in Afghanistan's remote and inhospitable Wakhan Corridor.

Dark winter brings new challenges in sub-zero temperatures; Andy maintains snow-covered trails; Sue fixes her generator; the Hailstones build a new teepee; Erik takes his wife hunting.

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.

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

Steve goes in search of the deadliest cats in Africa in the carnivore capital of Zambia; he gets up close to the rulers of the savanna, the lions and leopards.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

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

Steve goes in search of the deadliest cats in Africa in the carnivore capital of Zambia; he gets up close to the rulers of the savanna, the lions and leopards.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

Dark winter brings new challenges in sub-zero temperatures; Andy maintains snow-covered trails; Sue fixes her generator; the Hailstones build a new teepee; Erik takes his wife hunting.

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.

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.

Dark winter brings new challenges in sub-zero temperatures; Andy maintains snow-covered trails; Sue fixes her generator; the Hailstones build a new teepee; Erik takes his wife hunting.

Traveling to San Diego, Hope and Allison look to learn how to handle huge caseloads and dangerous animals.

A long-forgotten network of Native American earthworks, a baffling battlefield mystery in Belgium, a mysterious blood red lake on a remote Greek island, and an eerie pink glow emulating form the middle of the Pacific Ocean.

Gros Morne National Park is the result of continental collision.

Traveling to San Diego, Hope and Allison look to learn how to handle huge caseloads and dangerous animals.

A long-forgotten network of Native American earthworks, a baffling battlefield mystery in Belgium, a mysterious blood red lake on a remote Greek island, and an eerie pink glow emulating form the middle of the Pacific Ocean.

Gros Morne National Park is the result of continental collision.

Traveling to San Diego, Hope and Allison look to learn how to handle huge caseloads and dangerous animals.

The Hailstones hide emergency supplies along their hunting and trapping routes; Sue's connection with the outside world hangs in the balance; Erik falls while gathering firewood.

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

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

Steve goes in search of the deadliest cats in Africa in the carnivore capital of Zambia; he gets up close to the rulers of the savanna, the lions and leopards.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

The Hailstones hide emergency supplies along their hunting and trapping routes; Sue's connection with the outside world hangs in the balance; Erik falls while gathering firewood.

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

Tiger cubs that are only a few days old are prey for almost anything; hidden cameras follow the lives of tiger cubs growing up in India's jungle.

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.

Wonders created by life itself include the Amazon and a father and son brave killer bees in Bangladesh.

Tiger cubs that are only a few days old are prey for almost anything; hidden cameras follow the lives of tiger cubs growing up in India's jungle.

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.

Wonders created by life itself include the Amazon and a father and son brave killer bees in Bangladesh.

The Hailstones hide emergency supplies along their hunting and trapping routes; Sue's connection with the outside world hangs in the balance; Erik falls while gathering firewood.

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

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

The Hailstones hide emergency supplies along their hunting and trapping routes; Sue's connection with the outside world hangs in the balance; Erik falls while gathering firewood.

Incredible stories of wildlife rescue and rehabilitation.

Dive into the historical and natural secrets of the deep; explore an uninhabited concrete island, ocean spirals off the Australian coast, underwater evidence of a violent past and tracks thousands of metres below the sea's surface.

The crew explores the Atacama Desert, the world's driest non-polar region.

Incredible stories of wildlife rescue and rehabilitation.

Dive into the historical and natural secrets of the deep; explore an uninhabited concrete island, ocean spirals off the Australian coast, underwater evidence of a violent past and tracks thousands of metres below the sea's surface.

The crew explores the Atacama Desert, the world's driest non-polar region.

Incredible stories of wildlife rescue and rehabilitation.

Chip and Agnes head to Kiwalik River for hunting and fishing; Sue fabricates snowshoes to scout the tundra; Andy fights through frigid temperatures to replenish his resources; Erik and Martha set fur traps.

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

Tiger cubs that are only a few days old are prey for almost anything; hidden cameras follow the lives of tiger cubs growing up in India's jungle.

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.

Wonders created by life itself include the Amazon and a father and son brave killer bees in Bangladesh.

Chip and Agnes head to Kiwalik River for hunting and fishing; Sue fabricates snowshoes to scout the tundra; Andy fights through frigid temperatures to replenish his resources; Erik and Martha set fur traps.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

With summer nearing its end, Alaskans kick into high gear.

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.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

With summer nearing its end, Alaskans kick into high gear.

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.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Chip and Agnes head to Kiwalik River for hunting and fishing; Sue fabricates snowshoes to scout the tundra; Andy fights through frigid temperatures to replenish his resources; Erik and Martha set fur traps.

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

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.

Chip and Agnes head to Kiwalik River for hunting and fishing; Sue fabricates snowshoes to scout the tundra; Andy fights through frigid temperatures to replenish his resources; Erik and Martha set fur traps.

It is Hope's open house and with it brings incredible releases; Hope hears news that will change everything.

Traipsing along ancient pathways criss-crossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

A feature on the Andean Altiplano, a rugged plain in Bolivia.

It is Hope's open house and with it brings incredible releases; Hope hears news that will change everything.

Traipsing along ancient pathways criss-crossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

A feature on the Andean Altiplano, a rugged plain in Bolivia.

It is Hope's open house and with it brings incredible releases; Hope hears news that will change everything.

Andy makes snares; Erik and Martha cut into their last moose quarter; Chip and Agnus hunt caribou; Sue clears the plane runway for her snow machine delivery.

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

With summer nearing its end, Alaskans kick into high gear.

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.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Andy makes snares; Erik and Martha cut into their last moose quarter; Chip and Agnus hunt caribou; Sue clears the plane runway for her snow machine delivery.

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

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

Asking questions about the universe and how it came to be 13.8 billion years ago; inspecting images gathered by the Hubble and Planck space telescopes and clues that are giving scientists insight into the origins of life.

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

Asking questions about the universe and how it came to be 13.8 billion years ago; inspecting images gathered by the Hubble and Planck space telescopes and clues that are giving scientists insight into the origins of life.

Andy makes snares; Erik and Martha cut into their last moose quarter; Chip and Agnus hunt caribou; Sue clears the plane runway for her snow machine delivery.

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

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

Andy makes snares; Erik and Martha cut into their last moose quarter; Chip and Agnus hunt caribou; Sue clears the plane runway for her snow machine delivery.

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.

The differences between the Northern and Southern Rockies.

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

A 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.

Gros Morne National Park is the result of continental collision.

A long-forgotten network of Native American earthworks, a baffling battlefield mystery in Belgium, a mysterious blood red lake on a remote Greek island, and an eerie pink glow emulating form the middle of the Pacific Ocean.

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.

Tiger cubs that are only a few days old are prey for almost anything; hidden cameras follow the lives of tiger cubs growing up in India's jungle.

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.

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

With summer nearing its end, Alaskans kick into high gear.

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.

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

Steve Backshall and his team travel to Kyrgyzstan in search of snow leopards, one of the world's most endangered species.

With summer nearing its end, Alaskans kick into high gear.

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

Steve Backshall and his team travel to Kyrgyzstan in search of snow leopards, one of the world's most endangered species.

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 incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

Asking questions about the universe and how it came to be 13.8 billion years ago; inspecting images gathered by the Hubble and Planck space telescopes and clues that are giving scientists insight into the origins of life.

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.

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

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.

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.

The crew explores the Atacama Desert, the world's driest non-polar region.

Dive into the historical and natural secrets of the deep; explore an uninhabited concrete island, ocean spirals off the Australian coast, underwater evidence of a violent past and tracks thousands of metres below the sea's surface.

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.

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

Asking questions about the universe and how it came to be 13.8 billion years ago; inspecting images gathered by the Hubble and Planck space telescopes and clues that are giving scientists insight into the origins of life.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Levison begins his journey in Afghanistan's remote and inhospitable Wakhan Corridor.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

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

Steve goes in search of the deadliest cats in Africa in the carnivore capital of Zambia; he gets up close to the rulers of the savanna, the lions and leopards.

Tiger cubs that are only a few days old are prey for almost anything; hidden cameras follow the lives of tiger cubs growing up in India's jungle.

Tells an intimate and enchanting story of an emperor penguin chick's first precarious months on the ice, growing up in the world's most extreme nursery.

Brian learns that the solar system was once home to two blue planets.

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.

Tells an intimate and enchanting story of an emperor penguin chick's first precarious months on the ice, growing up in the world's most extreme nursery.

Brian learns that the solar system was once home to two blue planets.