Walking Hadrian’s Wall with Robson Green (2021)

Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.

In the year 2149, the world is dying. The planet is overdeveloped and overcrowded, with the majority of plant and animal life extinct. The future of mankind is in jeopardy, and its only hope for survival is in the distant past. An ordinary family goes on an extraordinary journey back in time to prehistoric Earth as a part of a massive expedition to save the human race.

Inspired by the Internet’s “404” error code, Dimension 404 aims to evoke that 3 AM feeling of wandering onto the weird side of the web, stumbling upon stories that cannot be explained in the world that we know.

Using a holographic computer she inherited from her father, Jerrica Benton turns herself and her pals into pop-music group Jem and the Holograms.

Learn how much fun counting can be with the Numberblocks - a fun-loving group of numbers who work together to solve problems big and small.

In a mysterious primeval land populated by dinosaurs and other extinct creatures, people from throughout human history have been resurrected. When 21st century Australian paleontologist Helena Walker awakes there after tragedy, she must learn to survive and find new allies, or die again at the hands of ruthless warlords, all while trying to uncover the true nature of their strange new world.

In his basement in San Francisco, boy-genius Quinn Mallory unlocks the doorway to an infinite number of Earths. During a test run, Quinn invites co-worker Wade Welles and his teacher Professor Maximillian Arturo to see his new invention. But an increase in power and an early departure leave all three, plus a washed-up soul singer named Rembrandt "Crying Man" Brown, lost in a parallel world. Now they must "slide" from world to world, not only adapting to their changing surroundings, but also trying to get back to their world. Will they ever make it home?

A group of teenagers go on a school camp in the Blue Mountains in Australia. While at the camp, Paul Reynolds accidentally goes into a parallel universe. This other world is inhabited by a more hierarchic and technologically different society, ruled by a group of people known as Spellbinders.

Explorer Levison Wood sets out to walk the length of the world's highest mountain range, from Afghanistan to Bhutan.

In the glorious setting of the Lake District, the lives of local farmers, food producers and crafters, whose work is sold at the celebrated, family-run Tebay Service Station, are followed.

Julia Bradbury sets out on four walks that explore South Africa's claim to be 'a world in one country', going far beyond the normal tourist destinations to a series of increasingly remote locations.

Be immersed in nature's beauty. Discover Hokkaido at its wildest and best as our presenter guides you through its amazing experiences.

Julia Bradbury takes her boots and backpack to the Continent to explore the landscape of Germany and the cultural movement that made it famous - Romanticism

Miriam Margolyes and Alan Cumming roll back the decades and return to their Scottish roots. Part rediscovery, part revelation, we follow them as they take to the road and motorhome their way through Scotland's Highlands and into its wildest places.