Hidden "void" found in Egypt's Great Pyramid

An illustration of the newly discovered void in Khufu's Pyramid, courtesy of ScanPyramids mission.

Scientists have probed Egypt's mysterious Great Pyramid of Giza with tools of modern particle physics and say they have discovered a hidden "void" within its ancient walls. The large space is roughly 100 feet long and situated above the pyramid's Grand Gallery, according to a report published in the scientific journal Nature Thursday.

Why it matters: The study suggests that modern advances in technology could lead to new discoveries and help create a better understanding of the ancient world — even in well-studied places, like the Great Pyramid, built around 2500 B.C. and considered to be one of the Seven Wonders of the World.