BBC Earth

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

Levison Wood sets out to walk the length of the River Nile from source to sea; his nine-month, seven-million-step journey takes him through jungles, savannah, deserts, cities and war zones in some of Africa's most remote and spectacular locations.

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.

After seven months walking, Lev reaches his final country: Egypt; he has 900 miles to go to the Mediterranean, but the authorities give him just 45 days to finish.

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

Meet the people that made filming Kingdom possible and uncover the extraordinary acts of conservationists and anti-poaching teams protecting South Luangwa and all its inhabitants.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Following early Homo sapiens's ancestors as they step out of Africa and venture into the wider world, into areas inhabited by other human species.

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.

After seven months walking, Lev reaches his final country: Egypt; he has 900 miles to go to the Mediterranean, but the authorities give him just 45 days to finish.

A Spinosaurus, the world's largest ever predatory dinosaur, struggles to bring up his babies and lead his young family across one of the deadliest environments on Earth.

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.

After seven months walking, Lev reaches his final country: Egypt; he has 900 miles to go to the Mediterranean, but the authorities give him just 45 days to finish.

A Spinosaurus, the world's largest ever predatory dinosaur, struggles to bring up his babies and lead his young family across one of the deadliest environments on Earth.

Levison Wood sets out to walk the length of the River Nile from source to sea; his nine-month, seven-million-step journey takes him through jungles, savannah, deserts, cities and war zones in some of Africa's most remote and spectacular locations.

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.

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.

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

The extraordinary story of how the human species, Homo sapiens, first emerged, where the discoveries of recent years are revolutionising the understanding of humanity's origin story.

Following early Homo sapiens's ancestors as they step out of Africa and venture into the wider world, into areas inhabited by other human species.

Shocking new insights into the demise of modern humans' sister species, the Neanderthals, Homo sapiens's possible role in their downfall and how it becomes the last human species on Earth.

During the height of the Ice Age, one of the coldest times humanity has ever known, Homo sapiens steps into the last habitable continents on the planet: the Americas.

Around 12,000 years ago, as the Ice Age finally thaws, humanity makes a dramatic shift - abandoning nomadic life for permanent settlements.

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.

Sir David Attenborough reveals new animal behaviors in the ocean.

Trekking across habitats where the rains determine life or death; following an ostrich chick in the fiery Namib Desert; a baboon vies for a sip at a watering hole; a maned wolf in a grassy Brazilian oasis.

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

Exploring forests as hidden worlds where the lives of animals are entwined, including temperate forests home to whistling wild dogs, as well as rainforests where ninja treehoppers fight off assassin bugs.

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.

After seven months walking, Lev reaches his final country: Egypt; he has 900 miles to go to the Mediterranean, but the authorities give him just 45 days to finish.

A Spinosaurus, the world's largest ever predatory dinosaur, struggles to bring up his babies and lead his young family across one of the deadliest environments on Earth.

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.

Sir David Attenborough reveals new animal behaviors in the ocean.

Meet the people that made filming Kingdom possible and uncover the extraordinary acts of conservationists and anti-poaching teams protecting South Luangwa and all its inhabitants.

The extraordinary story of how the human species, Homo sapiens, first emerged, where the discoveries of recent years are revolutionising the understanding of humanity's origin story.

Following early Homo sapiens's ancestors as they step out of Africa and venture into the wider world, into areas inhabited by other human species.

Shocking new insights into the demise of modern humans' sister species, the Neanderthals, Homo sapiens's possible role in their downfall and how it becomes the last human species on Earth.

During the height of the Ice Age, one of the coldest times humanity has ever known, Homo sapiens steps into the last habitable continents on the planet: the Americas.

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

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

Exploring forests as hidden worlds where the lives of animals are entwined, including temperate forests home to whistling wild dogs, as well as rainforests where ninja treehoppers fight off assassin bugs.

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

In 1989, a ferocious explosion on the sun's surface released a cloud of highly charged particles containing the energy of 20 million nuclear bombs, and this solar superstorm then hit Earth; in Quebec, Canada, the lights suddenly went out.

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.

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.

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.

On 2nd August 1932, American physicist Dr Carl Anderson captured the first ever image of antimatter. Antimatter has only ever been glimpsed in fleeting moments because as soon as it comes into contact with matter, both annihilate.

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.

An epic journey into the unknown, a realm that feels almost like science fiction.

Coral Reefs are vibrant undersea cities where life has found ways to survive.

The big blue is the world's greatest wilderness, far from shore and many kilometers deep.

From forests to undersea prairies, it is the green of the sea that brings life to oceans.

Following early Homo sapiens's ancestors as they step out of Africa and venture into the wider world, into areas inhabited by other human species.

Paul learns that Australia's most popular fruit, the Cavendish banana, is under threat of extinction, but discovers that a new disease resistant variety is being cultivated in a field in Far North Queensland.

Sir David Attenborough and Hindou Oumarou Ibrahim, an indigenous rights spokesperson, join Prince William to explore the story of humanity's wastefulness and how to move to a waste-free world.

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 male penguins hand over their newborns to the returning females.

Sir David Attenborough and Hindou Oumarou Ibrahim, an indigenous rights spokesperson, join Prince William to explore the story of humanity's wastefulness and how to move to a waste-free world.