Great Pyramid of Giza

Timeline

1. c.2580 BC

   Construction begins

   Old Kingdom 4th Dynasty Pharaoh Khufu commissions the pyramid under vizier Hemiunu in the largest national undertaking of Egyptian history.

2. c.2560 BC

   Pyramid completed

   After 20-30 years of construction, the Great Pyramid is complete at 146.6 m and stands as the tallest structure on earth, dominating ancient world.

3. c.2566 BC

   Khufu's death

   Pharaoh Khufu dies and is buried inside the pyramid, succeeded by his sons Djedefre and then Khafre, who builds the neighboring pyramid.

4. c.1500 BC

   Casing looted

   Tomb robbers under the Ramesside period plunder the King's Chamber sarcophagus; later eras strip the smooth outer casing for building reuse.

5. c.450 BC

   Herodotus' account

   Greek historian Herodotus describes the pyramids in Histories Book II, providing the earliest extant Western record of the monument.

6. 9th c.

   Al-Ma'mun's tunnel

   Abbasid Caliph al-Ma'mun forces an entry tunnel into the pyramid; the 'thieves' tunnel' survives today and serves as the modern visitor entrance.

7. 1798

   Napoleon's expedition

   Napoleon's Egyptian campaign brings the first systematic scientific survey, with the famous rallying cry 'forty centuries are looking down on you'.

8. 1880-1882

   Petrie's survey

   British archaeologist Flinders Petrie's precise measurements first scientifically confirm the sub-5 cm base precision and true-north alignment.

9. 1979

   World Heritage Site

   UNESCO inscribes Memphis and its Necropolis on the World Heritage List, with the three Giza pyramids and Sphinx all included as components.

10. 2002

    Robotic exploration

    The Pyramid Rover robot explores the Queen's Chamber shafts and discovers a small chamber beyond, ushering in 21st-century pyramid research.

11. 2017

    Hidden cavity found

    The ScanPyramids team announces a previously unknown 30+ meter cavity above the Grand Gallery using cosmic-ray muon imaging techniques.

12. 2018

    Merer Diary found

    Papyrus fragments from Wadi al-Jarf record c.2570 BC labor organization, confirming in writing the construction system for the first time ever.

13. 2024

    GEM partial opening

    The Grand Egyptian Museum near Giza opens partially, with Khufu's restored Solar Boat among the central exhibits of ancient Egyptian heritage.

Detailed History

Construction of Khufu's Great Pyramid is estimated at 2580-2560 BC during the Old Kingdom 4th Dynasty, as the tomb of the second Pharaoh of the dynasty, Khufu (r. c.2589-2566 BC). The project, supervised by his vizier Hemiunu, was the largest national undertaking in Egyptian history. Original height was 146.6 meters (today 138.8 m, with 7.8 m of the apex casing lost), the base measures 230.4 × 230.4 meters with sub-5 cm precision, and the alignment to true north is accurate to 1/15 of a degree. The exterior used limestone (lower courses from Tura, upper from local quarries); the King's Chamber and Grand Gallery used granite quarried at Aswan and shipped 800 km. About 2.3 million blocks (averaging 2.5 tons, with King's Chamber granite 40-80 tons each) were used. The construction method has been long debated; the Nile-plus-sled-plus-ramp theory remains the leading explanation, and in 2018 the Wadi al-Jarf Papyri ('Diary of Merer') confirmed in writing the labor organization and stone transport around 2570 BC. The interior has three levels: an unfinished subterranean chamber 30 meters underground; the Queen's Chamber (a 'fake' burial room on the central axis); and the King's Chamber (the granite-lined main burial room with an empty royal sarcophagus). The Grand Gallery (47 m × 8.5 m × 2.1 m) and four ventilation shafts (two from the King's Chamber rising at 31° and 45°, two from the Queen's Chamber sealed shut) round out the interior. The casing was looted from c.1500 BC during the Ramesside period and reused for medieval Cairo's mosques and palaces, leaving the stepped exterior visible today. Herodotus' Histories Book II (c.450 BC) gives the first Greek account, and medieval Islamic sources noted the pyramid as the 'world's tallest building'; Caliph al-Ma'mun forced an entry tunnel in the 9th century AD that survives as today's 'thieves' tunnel'. Napoleon's 1798-1801 Egyptian campaign began systematic study; 19th and 20th century European and American expeditions followed. UNESCO inscribed Memphis and its Necropolis (Giza included) in 1979. From 2002, robot exploration of the Queen's Chamber shafts has been ongoing; in 2017 the ScanPyramids project announced a previously unknown 30+ meter cavity above the Grand Gallery using cosmic-ray muography, confirmed in 2023, with continuing exploration through 2024.

Cultural Significance

The Great Pyramid is the only surviving ancient world wonder and stands at the very apex of human heritage. UNESCO inscribed Memphis and its Necropolis (which includes Giza) in 1979 under criteria (i)(iii)(vi): (i) for the absolute masterpiece of human creative genius, (iii) as testimony to ancient Egyptian civilization, and (vi) for universal influence on religious and cultural traditions. The pyramid's social meaning extends beyond a tomb to the materialization of the king's afterlife resurrection and cosmic order. Pyramid Texts inscribed on burial-chamber walls are considered the origin of Egyptian religious literature. From antiquity into our age, fringe theories (pyramid power, alien construction) have persisted, but modern Egyptology has used the Merer Diary and archaeological evidence to demonstrate that paid seasonal workers — not slaves — built it. The fact that it is the only ancient wonder still standing gave rise to Napoleon's 1798 phrase 'soldiers, from the height of these pyramids forty centuries are looking down upon you'. The 19th and 20th centuries saw major Egyptian collections shipped to the British Museum, the Louvre, Berlin and the Metropolitan, but the new Grand Egyptian Museum (GEM, near Giza, partial opening 2024 with full opening expected in 2025) is becoming the symbolic center for the repatriation of ancient Egyptian heritage to its homeland.

Architectural Details

Khufu's Great Pyramid is a square pyramid 230.4 meters per side and originally 146.6 m tall (138.8 m today), with a volume of about 2.6 million cubic meters. About 2.3 million limestone blocks (averaging 2.5 tons; King's Chamber granite 40-80 tons each) compose the body. The casing was bright Tura limestone polished smooth, of which only fragments survive near the apex. Alignment to true north is accurate to 1/15 of a degree. Inside are three levels: the subterranean chamber 30 m below ground (unfinished); the Queen's Chamber on the central axis at mid-height; and the King's Chamber off-axis to the south (5.2 × 10.5 × 5.8 m, fully granite-lined with a flat roof topped by five gravity-relieving courses). The Grand Gallery leading there is 47 m × 8.5 m × 2.1 m with a corbelled stepped ceiling — a marvel of stone construction. Ventilation shafts exit the King's Chamber at 31° north and 45° south, possibly aligned to Orion's Belt; from the Queen's Chamber they are sealed mid-shaft (2002 robotic exploration found a small chamber beyond). Surrounding the pyramid are three subsidiary pyramids of Khufu's queens, mastaba cemeteries, mortuary temples and the Solar Boat pit (boat moved to GEM in 2021).