Located in Egypt, the Great Pyramid of Giza is one of the seven wonders of the ancient world.
Experts have however now confirmed that there is more hidden space through the use of radiography scanning. This has led to the discovery of two 'cavities' that were previously unknown.
This was discovered On Saturday, October 2016 when experts scanned the monument using radiography equipment.
Further tests are being conducted to determine the nature, function and size of the enclosures.
Built 4500 years ago, the monument, also known as the Pyramid of Khufu is 480 feet tall. Originally intended to be a Pharaoh's tomb like the other chambers in Egypt, the pyramid has three known chambers.
In a statement by Operation ScanPyramids, the scientists investigating the monument with radiography and 3D reconstruction, they said: "We are now able to confirm the existence of a 'void' hidden behind the north face, that could have the form of at least one corridor going inside the Great Pyramid."
Operation ScanPyramids began their investigations and research in October 2015 in the Pyramid of Khufu, the Khafre in Giza, and the Bent and Red pyramids in Dahshur, Cairo.
The project uses a mixture of infrared thermography, muon radiography imaging and 3D reconstruction, technologies believed to be non-invasive and non-destructive.