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Giza pyramids

Giza pyramids
Image: Eduard Spelterini, Wikimedia Commons, Public domain. Resized; not otherwise altered. All credits.
LocationGiza Plateau, Greater Cairo, Egypt
Conventional dateFourth Dynasty, about 2600–2500 BCE (Khufu, Khafre, Menkaure).
Alternative date proposals
  • Graham Hancock; Robert Schoch: Built mainly in the Old Kingdom on older foundations: bedrock mound, Subterranean Chamber and early Sphinx work proposed to date to about 10,500 BCE (untested) [13][14]
  • Robert Bauval; Graham Hancock: Layout copies Orion's Belt as it looked about 10,500 BCE (shape match tests as significant; the date is not supported by the layout's angle) [15][16]
  • Malanga, Biondi & Mei (2025): Deep structures beneath Khafre dated by the team to about 38,000 years (not peer reviewed; method paper retracted 2026) [9][8]
What is measured
  • Mortar radiocarbon: 1984 dates from Dynasty 3–5 monuments averaged 374 years older than the historical dates; 1994–95 dates about 100–200 years older. The Great Pyramid's 46 dates, almost all on charcoal from exposed outer courses, calibrate to about 2870–2600 BCE. [10][1]
  • Muon imaging found the Big Void (2017) and the North Face Corridor (2023). [4][5]
  • An extinct Nile branch (Ahramat) ran along the pyramid field. [6]
  • Papyri from Khufu's Red Sea harbour record Tura limestone shipped to 'Akhet-Khufu' in about Year 26 of his reign. [11]
  • The 2015 survey found the Great Pyramid's sides turned on average 3′54″ from the cardinal directions. [12]

The Great Pyramid was the tallest human-made structure for thousands of years. Evidence for Fourth Dynasty construction includes radiocarbon dates on mortar and the reconstructed Nile branches that carried building material to the plateau. Open questions include construction methods and the purpose of the newly found internal spaces.

Claims about this site

ClaimStatusVerdict
The Great Sphinx is thousands of years older than Egyptologists think (water-erosion hypothesis)Leading EdgeOpen question
The Sphinx faced Leo rising at the spring equinox around 10,500 BCELeading EdgeMeasured sky: Leo rose before the equinox Sun at Giza from about 11,400 to 8,800 BCE, so 10,500 BCE fits; whether the Sphinx was built for this, and when, is an open question
Radiocarbon dates from Giza mortar fall in the Old Kingdom era, with an unresolved offsetMainstreamMeasured: mortar charcoal dates to c. 2900–2600 BCE; the cause of a 100–400-year offset is still debated
The Giza pyramids mirror Orion's Belt as it looked in 10,500 BCE (Orion Correlation)Leading EdgeOpen question: the shape match tests as statistically notable; the 10,500 BCE date is not supported by the layout's angle
The Fourth Dynasty completed an older Giza site (the 'legacy' or restoration hypothesis)Leading EdgeOpen question: the built pyramids date to the Old Kingdom; no dating method has yet reached the bedrock and underground parts
The Great Pyramid's precision and its 1:43,200 scale model of the EarthLeading EdgeMeasured: aligned within about 4 arc minutes and within about 1% of Earth's proportions at 1:43,200; whether the scale is intentional is an open question
Hidden spaces inside the Great Pyramid detected by cosmic-ray muonsMainstreamMeasured: two unknown voids confirmed
Satellite radar reveals vast structures beneath the Khafre pyramidLeading EdgeOpen question: unverified; the method's 2022 paper was retracted in Aug 2026
Pyramids around the world point to a common lost sourceLeading EdgeOpen question

Visiting: Giza pyramids and Sphinx

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Sources

  1. Bonani, G. et al. (2001). Radiocarbon dates of Old and Middle Kingdom monuments in Egypt. Radiocarbon 43(3). doi:10.1017/s0033822200038558 data
  2. Dee, M. W. et al. (2009). Reanalysis of the chronological discrepancies obtained by the Old and Middle Kingdom Monuments Project. Radiocarbon 51(3). doi:10.1017/s0033822200034111 data
  3. Bronk Ramsey, C. et al. (2010). Radiocarbon-based chronology for dynastic Egypt. Science 328. doi:10.1126/science.1189395 data
  4. Morishima, K. et al. (2017). Discovery of a big void in Khufu's Pyramid by observation of cosmic-ray muons. Nature 552. doi:10.1038/nature24647 data
  5. Procureur, S. et al. (2023). Precise characterization of a corridor-shaped structure in Khufu's Pyramid by observation of cosmic-ray muons. Nature Communications 14. doi:10.1038/s41467-023-36351-0 data
  6. Ghoneim, E. et al. (2024). The Egyptian pyramid chain was built along the now abandoned Ahramat Nile Branch. Communications Earth & Environment 5. doi:10.1038/s43247-024-01379-7 data
  7. Sheisha, H. et al. (2022). Nile waterscapes facilitated the construction of the Giza pyramids during the 3rd millennium BCE. PNAS 119. doi:10.1073/pnas.2202530119 data
  8. Remote Sensing editors (10 Aug 2026). Retraction notice for Biondi & Malanga 2022: 'serious methodological flaws and statistical errors'; the authors disagree. doi:10.3390/rs18162679 notice
  9. National Geographic (2025). Is there really a secret city under Egypt's Giza pyramids? (reporting on the March 2025 Khafre claims and expert responses). https://www.nationalgeographic.com/history/article/is-there-a-secret-… background
  10. Members of the David H. Koch Pyramids Radiocarbon Project (1999). Dating the Pyramids. Archaeology 52(5). https://archive.archaeology.org/9909/abstracts/pyramids.html data
  11. Tallet, P. (2017). Les papyrus de la mer Rouge I: le 'journal de Merer' (MIFAO 136). IFAO, Cairo (publisher's summary). https://www.ifao.egnet.net/uploads/publications/divers/MIFAO136_ann_01.pdf data
  12. Dash, G. & Paulson, J. (2016). The 2015 survey of the base of the Great Pyramid. Journal of Egyptian Archaeology 102. doi:10.1177/030751331610200114 data
  13. Peet, P. (2016). New claims about the Great Pyramid, citing the oldest papyrus ever found (includes an emailed statement from Graham Hancock). grahamhancock.com, 29 September 2016. https://grahamhancock.com/peetp1/ proponent
  14. Robert Schoch on The Joe Rogan Experience #1124 (2018), transcript. https://jre.ai/episodes/1124-robert-schoch/transcript proponent
  15. Bauval, R. & Gilbert, A. (1994). The Orion Mystery. Heinemann. https://openlibrary.org/search?q=the+orion+mystery+bauval proponent
  16. Allan, E. (2026). A comprehensive statistical evaluation of the Orion–Giza correlation. Journal of Astronomical History and Heritage 29(2): 367–378. doi:10.3724/sp.j.1440-2807.2026.02.06 data

Dates are summarised in our own words from the sources listed. Conventional and alternative dates are both reported; "measured" lists only dated or documented findings. Methodology.