Built to Last an Eternity
The Great Pyramid of Giza is the oldest of the Seven Wonders of the Ancient World — and the only one still standing. Constructed during the reign of Pharaoh Khufu around 2560 BCE, it originally stood approximately 146 metres tall and was the tallest human-made structure on Earth for nearly 4,000 years. It contains an estimated 2.3 million stone blocks, each weighing between 2 and 80 tonnes.
For centuries, the question of how it was built captivated engineers, historians, and archaeologists alike. Modern research has answered some of those questions — but not all of them.
Who Built the Pyramids?
The old myth of slave labour has been firmly overturned by archaeological evidence. Excavations near the Giza plateau — particularly the discovery of a workers' village in the 1990s — revealed that the pyramid builders were skilled, organised workers who received rations of bread, beer, fish, and meat. Graffiti left by work gangs with names like "Friends of Khufu" suggests pride in their work, not the labour of enslaved people.
The workforce is estimated to have included tens of thousands of workers rotating in shifts, supported by a large logistical system for feeding and housing them.
How the Blocks Were Moved
One enduring question concerns the transportation of massive stone blocks from quarries to the construction site. Recent discoveries have provided compelling answers:
- Sledges on lubricated tracks: Experiments and ancient wall paintings suggest stones were placed on wooden sledges and dragged over wet sand, which significantly reduces friction.
- Internal ramps: French architect Jean-Pierre Houdin proposed that after an external ramp was used for lower courses, internal spiral ramps may have been used for higher levels. Microgravimetry surveys of the pyramid have found anomalies consistent with this theory.
- Waterway transport: A papyrus discovered at Wadi al-Jarf — the oldest papyrus ever found — describes an official named Merer transporting limestone blocks by boat along canals to the Giza site. This direct written evidence transformed understanding of the logistics involved.
Hidden Chambers and Modern Scanning
In recent years, cutting-edge technology has revealed new secrets inside the pyramids. The ScanPyramids project, which uses muon tomography (a technique that uses cosmic-ray particles to detect density variations inside solid structures), identified a large previously unknown void inside the Great Pyramid in 2017. This corridor-like cavity, at least 30 metres long, sits above the Grand Gallery.
In 2023, a narrow passage was confirmed just behind the main entrance — approximately 9 metres long, filled with sand, its purpose still under investigation.
Why the Pyramid Shape?
The pyramid form was not arbitrary. It is believed to represent the benben — the primordial mound upon which the sun god Ra stood at the moment of creation in ancient Egyptian cosmology. The sloping sides may also symbolise the rays of the sun descending to earth. The precise orientation of the pyramids to the cardinal directions — achieved with remarkable accuracy — reflects the deep integration of astronomy into ancient Egyptian religious and architectural practice.
Key Facts: The Great Pyramid of Giza
- Built c. 2560 BCE for Pharaoh Khufu (Cheops)
- Original height: approximately 146.5 metres
- Base length: approximately 230 metres per side
- Aligned to true north within a fraction of a degree
- Constructed over an estimated 20-year period
What Remains Unknown
Despite centuries of study, the pyramids still hold secrets. The precise method of placing blocks near the summit remains debated. The full extent of internal chambers is not yet known. And the deeper question — the complete ritual and symbolic meaning encoded in the structure's design — may never be fully recovered from the archaeological record.
That combination of hard archaeological evidence and persistent mystery is precisely what makes the pyramids one of the most enduring subjects of human curiosity.