The Great Pyramid of Giza has been shrouded in mystery for millennia, but now a long-held secret of its structure might be known thanks to particle physics.

A narrow void lying deep within the ancient Wonder of the World has been found by scientists using cosmic-ray based imaging.

The internal structure is located above the Grand Gallery — which links two of the Pyramid’s chambers — and traces a similar route for at least 30 metres (100ft).