Nature documentary. Adventurer Steve Backshall embarks on a dramatic expedition to explore Venezuela's tepuis - ancient, sheer-sided mountains cut off from the jungle below. Show more

Science series. People like to think they are in control of their lives - of what they feel and think. But scientists are now discovering this is often simply an illusion. Show more

Nature documentary. Joining up with a team of elite Italian cavers, Steve ventures deep within a tepui, inside a newly discovered cave. Show more

Professor Iain Stewart examines the powerful geological forces that unleashed the devastating Japanese earthquake, bringing Japan to the brink of a nuclear meltdown. Show more

Series exploring topical scientific issues. Horizon meets the scientists working to make fatal car crashes a thing of the past and looks at the most advanced car crash tests. Show more

Documentary about Angkor in Cambodia, once the biggest city on earth. Archaeologists use a new technology called lidar to unlock its secrets. Show more

Horizon follows the astronomers pushing the limits of science and engineering with a new generation of supertelescopes in the hunt for mysterious objects in the universe. Show more