BBC Earth HD

'S1/E1 - Thessaloniki to Delphi'. Arriving in the northern Greek city of Thessaloniki, Alice Roberts learns about local legend Alexander the Great and his father, Philip II, the King of Macedon.

'S1/E1'. How did a small island create the biggest empire the world has ever seen? David Olusoga uncovers a living legacy.

'S3/E9 - Sri Lanka'. Ben meets Janey, a vet, who took it upon herself to rescue and nurse back to health hundreds of dogs in Sri Lanka.

'S12/E12 - 100 Miles from Nowhere'. Alaskan residents look to restock their food supplies as spring brings longer days. This season, the hardy residents face fresh threats to their survival.

'S4/E5 - Southern Australia'. A coast-to-coast journey through the Australian outback along the iconic Indian Pacific Railway. It takes two days to travel from Sydney to Adelaide.

'S1/E8 - Lisbon Part 2'. Michael embraces the spirit of the great navigators, uncovers the origins of the spy with a license to kill, discovers a lavish 18th century party palace, and turns sleuth to find a secret restaurant.

'S1/E1 - Thessaloniki to Delphi'. Arriving in the northern Greek city of Thessaloniki, Alice Roberts learns about local legend Alexander the Great and his father, Philip II, the King of Macedon.

'S1/E1'. How did a small island create the biggest empire the world has ever seen? David Olusoga uncovers a living legacy.

'S3/E9 - Sri Lanka'. Ben meets Janey, a vet, who took it upon herself to rescue and nurse back to health hundreds of dogs in Sri Lanka.

'S12/E12 - 100 Miles from Nowhere'. Alaskan residents look to restock their food supplies as spring brings longer days. This season, the hardy residents face fresh threats to their survival.

'S4/E5 - Southern Australia'. A coast-to-coast journey through the Australian outback along the iconic Indian Pacific Railway. It takes two days to travel from Sydney to Adelaide.

'S1/E8 - Lisbon Part 2'. Michael embraces the spirit of the great navigators, uncovers the origins of the spy with a license to kill, discovers a lavish 18th century party palace, and turns sleuth to find a secret restaurant.

'S4/E4 - Norway'. In this episode we travel from Bergen to Oslo, on a super-fast train.

'S1/E3'. In the beautiful Monsal Valley in Derbyshire, Paul teaches Bob how to fly-fish for wild rainbow trout. While fishing, they discuss their humble beginnings in show business.

'S1/E1 - In Search of the Source'. Ash and his team battle rapids, dense jungle and wildlife to uncover the hidden source of the Coppename River.

'S4/E4 - Norway'. In this episode we travel from Bergen to Oslo, on a super-fast train.

'S11/E11 - Waking from Winter'. As winter comes to an end, Alaskans journey, hunt, and prepare for spring.

'S10/E11 - Lincolnshire'. Ben heads to northern England and stays with host Paul in Lincolnshire onboard his 30-year-old converted military truck. He discovers why Paul traded living in a house for life on the road.

'S1/E8 - Lisbon Part 2'. Michael embraces the spirit of the great navigators, uncovers the origins of the spy with a license to kill, discovers a lavish 18th century party palace, and turns sleuth to find a secret restaurant.

'S1/E1 - Thessaloniki to Delphi'. Arriving in the northern Greek city of Thessaloniki, Alice Roberts learns about local legend Alexander the Great and his father, Philip II, the King of Macedon.

'S3/E9 - Sri Lanka'. Ben meets Janey, a vet, who took it upon herself to rescue and nurse back to health hundreds of dogs in Sri Lanka.

'S12/E12 - 100 Miles from Nowhere'. Alaskan residents look to restock their food supplies as spring brings longer days. This season, the hardy residents face fresh threats to their survival.

'S1/E4 - Caves'. Caves contain some of the most dramatic and unusual phenomena in nature, including birds' nests made from saliva and fish that cling to walls.

'S10/E12 - Sri Lanka'. Ben stays with Naveen and Anke who have made their home in the Sri Lanka's highlands. He uncovers why they swapped one of the biggest cities in the world for a simple off-grid existence miles from civilisation.

'S11/E12 - Destroyer of Worlds'. When spring finally arrives in Alaska, the landscape and waterways come back to life with a vengeance as the snow and ice melt.

'S4/E4 - Norway'. In this episode we travel from Bergen to Oslo, on a super-fast train.

'Sue Perkins' Big Adventure: Paris To Istanbul. S1/E3'. In Salzburg, Sue becomes a yodelling YouTuber and does yoga with alpacas. In Vienna, she waltzes, goes hot rod racing and has the fattiest dumplings in the world.

'S1/E2'. Halfway through their trek, Lucy and the team face dense forests and the ever-present threat of elephants, as rations run dangerously low.

'S1/E9 - Lisbon Part 3'. Michael's tackles a 700-year old stick-fighting marital art, witnesses divine illumination at a magnificent monastery, and discovers a chocolate cake with global ambitions.

'S4/E5 - Southern Australia'. A coast-to-coast journey through the Australian outback along the iconic Indian Pacific Railway. It takes two days to travel from Sydney to Adelaide.

'Sue Perkins' Big Adventure: Paris To Istanbul. S1/E4'. Sue puts on her dancing shoes and blags a backstage pass at Budapest's hottest party. The morning after, the city's soothing hot springs beckon.

'S1/E3'. The team enter the Serengeti where lions roam free and danger is always near. With water running out, their final challenge awaits.

'S4/E1 - Revisit: Queensland'. The adventurer returns to meet previous contributors who turned their back on the rat-race. In the wilds of Queensland he revisits the ever-resilient Bette.

'S12/E13 - Into the Tundra'. The everyday struggles of living in the secluded state of Alaska where one wrong decision could cost you your life.

'S4/E6 - Far North Scotland'. We travel the Far North Line between Inverness and Wick, a four-hour ride that travels along the coast, and has Dunrobin Castle as one of its sights along the way.

'S1/E9 - Lisbon Part 3'. Michael's tackles a 700-year old stick-fighting marital art, witnesses divine illumination at a magnificent monastery, and discovers a chocolate cake with global ambitions.