Fig 1Inside the Great PyramidSlice it open · pick a room
As built, c. 2560 BC: white Tura limestone casing to the apex
Found by muon imaging
Section through the stonePassages and rooms (measured)Found by muon imaging (shape uncertain)Khufu's pyramid was built about 4,500 years ago from roughly 2.3 million stone blocks. Inside, it is almost all solid stone. Its few tunnels and rooms line up in one thin slice just east of the middle. The two striped spaces were found only recently, by counting tiny particles from space that pass through stone. Nobody has been inside them yet.