The Great Pyramid of Giza is the oldest of the Seven Wonders of the Ancient World. While erosion has reduced its initial 481-foot height to just over 455 feet, the pyramid was the tallest man-made structure in the world for the 3,800 years directly following its construction around 2560 BC.
Believed to have been erected as a tomb for the Fourth Dynasty Egyptian pharaoh Khufu (2589–2566 BC), the pyramid has long been known to contain four internal structures. They include a lengthy passage called the Grand Gallery, which leads to the Queen’s Chamber and the King’s Chamber. There is also an unfinished chamber cut into the bedrock upon which the monument was built.
In March 2016, Mehdi Tayoubi of the HIP Institute in Paris and his team were investigating the pyramid when they detected a previously unknown space comparable in size to the over 154-foot-long and 26-foot-tall Grand Gallery.
“We felt very excited as we understood that we may have found something big,” Tayoubi, who is the co-director of the ScanPyramids mission, told Seeker.
New research, published in the journal Nature, has confirmed that a “void” measuring at least 98 and a half feet long exists within the pyramid and above, but separate from, the Grand Gallery.
“The Grand Gallery is a spectacular internal structure, a kind of internal cathedral at the center of the pyramid,” Tayoubi said.