BBC Earth HD

'S1/E3'. As the teams approach the halfway point, they must navigate their way from the Mediterranean island of Corsica to the third checkpoint in Zermatt, a mountain resort nestled in the Swiss Alps.

'S7/E6 - Ethiopia'. Native Glaswegian Susan rejected retirement for a remote region of Africa, where she has set up both a school and a mountain-top restaurant.

'Joanna Lumley's Danube: Europe's Mightiest River. S1/E4 - Romania'. Joanna heads towards the Danube Delta, one of the last great wilderness areas remaining in Europe, full of birdlife including the majestic Pelican.

'S1/E2 - The Fight for Egypt's Past'. A look at the extraordinary story of Egypt in the years between the World Wars - a time when archaeology became entangled in the politics of a nation striving for sovereignty.

'S11/E6 - Italy'. In the mountains of Piedmont, Ben meets Father Johannes, who lives an isolated life while fulfilling duties as a priest. Ben finds they have more in common than expected.

'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.

'S1/E2 - Above the Clouds'. 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.

'S7/E7 - Panama'. Ben meets Jaimie, an eccentric inventor originally from Vermont who lives with his family on a group of islands he has bought off the coast of Panama.

'S1/E4'. Budgets are dwindling and the intensity of the race is stepping up as the teams leave western Europe behind.

'S1/E3 - Wales'. Take a seat on the Cambrian Line and be whisked away on an unforgettable voyage to a lost world, with majestic castles and ingenious Victorian engineering.

'S1/E2'. In his first visit to Nigeria, labelled the 'Giant of Africa', Michael Palin embarks on an epic 1,300-mile journey.

'Big Adventures: into the Amazon with Robson Green. S1/E3'. Robson explores the stunningly beautiful Anavilhanas Archipelago in his canoe.

'S1/E1'. Rob Rinder and Rylan are going out of the art galleries and into the teeming streets of one of the world's oldest and greatest civilisations - India.

'S1/E4 - Switzerland'. Bill Nighy narrates a journey that starts at Tirano and climbs up through the Italian Alps and lakes through into Switzerland, taking in the Landwasser Viaduct.

'S1/E3'. In his first visit to Nigeria, labelled the 'Giant of Africa', Michael Palin embarks on an epic 1,300-mile journey.

'S1/E1'. As Lucy and her Indigenous team begin their unique 50-day journey into virgin Amazon rainforest, they can hear the whistling of the deadly bushmaster snake...

'S11/E7 - Australia, Fort Grey'. Ben embarks on an epic journey to meet one of the most remote families he's encountered, uncovering what drove academics and married couple Bec and Reece to leave civilisation for complete isolation.

'S11/E13 - Bulletproof'. Alaskans contend with the throes of the warm season.

'S1/E5 - Spain'. Beginning near Leon, part of the famous north Spanish Pilgrimage, in the Picos de Europa mountains, this railway journey then runs through the Basque country before arriving in Bilbao.

'S1/E1'. Rob Rinder and Rylan are going out of the art galleries and into the teeming streets of one of the world's oldest and greatest civilisations - India.