How were the pyramids built? What the evidence shows

What archaeology found: who built the pyramids

How were the pyramids built? By organized Egyptian crews working for their kings, and the best-documented case is Giza, about 4,500 years ago. The Great Pyramid, the tomb of King Khufu (c. 2589–2566 BC), is built of local limestone and was once cased in fine limestone shipped from Tura. Blocks moved on sledges and boats and went up ramps. Egypt's antiquities ministry estimates the work took 10 to 20 years and gives the original height as 146.5 meters.

Who built the pyramids is the best-evidenced part. In the 1980s the Egyptologist Mark Lehner began asking where the builders' construction site had been. In December 1988 Ancient Egypt Research Associates (AERA) started excavating a settlement 400 meters south of the Sphinx, with workshops, bakeries, kitchens, warehouses and royal grain silos. AERA describes it as the base of operations for the pyramid complexes of Menkaure, Khafre and probably Khufu.

The builders were buried nearby. Graves of pyramid workers were first found at Giza in 1990. In January 2010 Zahi Hawass, then head of Egypt's Supreme Council of Antiquities, announced more tombs beside the pyramids and argued that slaves could not have built tombs next to their king's. Evidence from the site, he said, points to about 10,000 laborers, rotated every three months and sent 21 cattle and 23 sheep a day.

What archaeology found: the Merer papyri

The most direct written evidence came from Wadi el-Jarf, a Fourth Dynasty harbor on the Red Sea that supported mining in Sinai. There, in 2013, a team led by Pierre Tallet of the University of Paris-Sorbonne excavated the oldest inscribed papyri ever found. They include the logbooks of an inspector named Merer, whose phyle, a crew of some 40 men, is recorded for just over a year near the very end of Khufu's reign.

Merer's men loaded fine limestone at Tura North and Tura South, on the east side of the Nile, and sailed downstream to Giza, in one ten-day stretch making two or three round trips. Boats entered the Lake of Khufu, part of a network of dredged canals that reached the edge of the plateau. The blocks were the kind used to encase the Great Pyramid, and the crew was fed bread, beer, poultry, fish and fruit.

The mainstream explanation: sledges and water

In 2014 a University of Amsterdam team supervised by Daniel Bonn reported in Physical Review Letters that the right amount of water in desert sand halves the force needed to pull a sledge. Wet sand is about twice as stiff as dry sand, so it does not pile up in front of the load. A wall painting in the tomb of Djehutihotep shows a person on a sledge pouring water onto the sand just ahead of it.

Water was also the long-distance route. A 2024 study in Communications Earth & Environment, led by Eman Ghoneim of the University of North Carolina Wilmington, used radar satellite imagery, ground surveys and sediment cores to map an abandoned Nile branch about 64 kilometers long, named the Ahramat Branch. Thirty-one pyramids, from the Old Kingdom through the Second Intermediate Period, stand along its course between Giza and Lisht, and the authors propose that valley temples at the ends of causeways served as river harbors.

The mainstream explanation: ramps

For raising stone, the mainstream answer is ramps. In 2018 the University of Liverpool and the French Institute for Oriental Archaeology in Cairo reported a ramp system from Khufu's reign at Hatnub, an alabaster quarry in Egypt's Eastern Desert. It has a central ramp flanked by two staircases with numerous post holes. With ropes tied to wooden posts, workers could pull alabaster blocks out of the quarry up slopes of 20 percent or more.

Popular alternative claims

One rival story is that slaves built the pyramids. The evidence points elsewhere: builders' tombs beside the royal monuments, daily meat deliveries, three-month rotations, and a crew the papyri call the setep za, “the chosen phyle.” That does not make the work easy or voluntary in a modern sense. It makes the builders Egyptians inside a state system that housed, fed and buried them.

The best-known modern claim is that aliens built the pyramids. In 2020 Elon Musk posted “Aliens built the pyramids obv.” Zahi Hawass replied that archaeological, historical and linguistic evidence proves Egyptians built them, pointing to tombs that refer to Khufu and his pyramid and to the Wadi el-Jarf papyri. Egypt's minister of international cooperation, Rania al-Mashat, invited Musk to come and see the tombs of the pyramid builders.

A third set of claims says the Great Pyramid was a machine or power station built with lost technology, not a tomb. These claims rest on what is missing, chiefly the king's body. What is present points to burial: the ministry describes the sarcophagus in the King's Chamber as the one in which Khufu was once laid to rest, and two dismantled ships found in pits beside the pyramid are believed to have carried his mummy and burial equipment.

What is still unsolved

The pyramids mystery that survives the evidence is narrower than the popular one. Egypt's antiquities ministry says it is not entirely certain how the Great Pyramid was built, and the ScanPyramids physicists call its construction process one of the most important archaeological mysteries. The gap is the last step, lifting blocks course by course to 146.5 meters. Hatnub is a quarry, not Giza, and no excavation has settled which ramp layout finished the Great Pyramid.

The interior also holds unexplained spaces. Using detectors that record cosmic-ray muons, ScanPyramids reported in Nature in 2017 a void about 30 meters long above the Grand Gallery. In 2023 the team measured a corridor about 9 meters long and about 2 by 2 meters in cross-section behind the chevron structure on the north face. The published measurements do not establish what either space was for.

Verdict: the pyramids explained

The pyramids explained in one line: a state project built by organized, fed and rotated Egyptian crews with local stone, river transport, sledges and ramps. Real or Legend files this record as confirmed for its main question, who built the pyramids and by what means, because the workers' town, the tombs, the Merer logbooks and the transport studies agree. What is still argued is how the ramps were arranged to finish the Great Pyramid, a question of engineering, not authorship.