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Horizon: The Mystery Of Dark Energy

Natural History

Discovered in 1998, we still don't know what dark energy is, but it calls into question Albert Einstein's general theory of relativity - the cornerstone of modern physics.

This programme is not currently available on demand

Abandoned Engineering

The World at War

Secrets of the London Underground

Nazi Hunters

How Britain Worked

World War Weird

The Architecture the Railways Built

Speed with Guy Martin

Forbidden History

Impossible Engineering

War Factories

Secret Nazi Bases