Archaeology workers toil in front of the Great Pyramid, in Giza, Egypt, in 2010. Researchers say they've discovered a new room inside the ancient structure.

The Great Pyramid of Giza has been probed with the tools of modern particle physics by scientists who say they have discovered a huge, secret space hidden within its ancient walls.

The Great Pyramid of Giza has been probed with the tools of modern particle physics by scientists who say they have discovered a huge, secret space hidden within its ancient walls.

Using modern scanning technology, experts have discovered signs of a hidden void inside the Great Pyramid. The implications are massive, suggesting untouched chambers or even unknown functions ...