Learnology: How Were the Egyptian Pyramids Built?

Engraving of the Pyramids of Giza

Ancient Egypt was home to more than 100 pyramids, many of which still stand today. One of the oldest monumental pyramids in Egypt, the Step Pyramid of Djoser, was built sometime between 2667 BCE and 2648 BCE and began a period of pyramid construction lasting more than a thousand years. The most famous monuments are found at the Giza complex, home to the Great Pyramid, the Pyramid of Khafre, and the Pyramid of Menkaure, all built during the Fourth Dynasty around 2600 to 2500 BCE — the golden age of ancient Egypt.

The Egyptian pyramids stand as one of humanity’s most remarkable architectural achievements, and their incredible precision and massive scale have confounded researchers for centuries. Despite numerous theories and extensive archaeological research, the exact methods of their construction remain a subject of scholarly debate. How did ancient Egyptians erect pyramids using millions of massive blocks weighing as much as 2.5 tons each? And how, more specifically, did they move those blocks up the superstructure? To this day, there is no known historical or archaeological evidence that resolves the question definitively. While popular speculation often veers into fantastical explanations — yes, including aliens — serious historians and archaeologists have given much thought as to how these monumental structures might have been erected using the technological capabilities of the time. Here are three of the most likely construction theories.

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The Herodotus Machine

The first historical account of the construction of the pyramids came from the ancient Greek historian Herodotus in the fifth century BCE. In his Histories, he wrote that the Great Pyramid took 20 years to build and demanded the labor of 100,000 people. Herodotus also wrote that after laying the stones for the base, workers “raised the remaining stones to their places by means of machines formed of short wooden planks. The first machine raised them from the ground to the top of the first step. On this there was another machine, which received the stone upon its arrival and conveyed it to the second step,” and so on. These “Herodotus Machines,” as they later became known, are speculated to have used a system of levers or ropes (or both) to lift blocks incrementally between levels of the pyramid. Egyptian priests told Herodotus about this system — but it’s important to note that this was a long time after the construction of the Great Pyramid, so neither the priests nor Herodotus were actual eyewitnesses to its construction. It is certainly feasible, however, that the machines he described may have been used, either by themselves or, more likely, in conjunction with other methods.

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The External Ramp Theory

Archaeologists generally agree that a system of ramps must have been used, in some form or another, to drag the millions of blocks into their positions in the various pyramids. While there’s no remaining physical evidence of external ramps at the Great Pyramid, traces can be seen around some of the other Old Kingdom structures. One initial theory posited the use of a single, linear ramp built on one side of the pyramid, which would have been gradually raised as the pyramid progressed. But, considering that an 8% slope is about the maximum possible slope for moving such heavy blocks, a ramp such as this would have needed to be about a mile long to reach the top of the pyramid. That would mean constructing the ramp would have been as much of a task as building the pyramid itself, making the theory unlikely, especially for larger structures such as the Great Pyramid. There are a few other ramp theories, however. One proposes that a series of switchback, or staircase, ramps could have been built, zigzagging up just one face of the pyramid. Traces of these have been found at the Sinki, Meidum, Giza, Abu Ghurob, and Lisht pyramids. Other archaeologists have speculated that a spiraling ramp could have been used, which would have wrapped around the entire pyramid. This is a popular theory, although it does have its problems. As with the straight or linear ramp, this ramp would potentially have been a mile long if it was used to build the Great Pyramid, making it in itself a massive construction project. It’s also not clear how workers could have maneuvered 2.5-ton blocks around the corners of the ramp. Archaeologist Mark Lehner did make a practical demonstration of how this could be done, but it was on a far, far smaller pyramid.

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The Internal Ramp Theory

In 2007, the French architect Jean-Pierre Houdin offered a new theory to solve the mystery of how Egypt’s Great Pyramid was built. Using archaeological research combined with 3D computer modeling, he argued that the Egyptians used an internal — rather than external — system of ramps to build the pyramid. Workers, he theorized, used an outer ramp to build the first 141 feet, then constructed a spiraling inner ramp to carry stones to the apex of the 482-foot-tall pyramid. Using this technique, Houdin argued, the pyramid could have been built by around 4,000 people instead of 100,000, as other theories suggest.The internal ramp theory was met with much intrigue, with some archaeologists skeptical and others arguing that it’s as valid as any other concept. Interestingly, Houdin’s proposal would explain why no evidence of ramps has been found at the Great Pyramid: They could be still there, hidden inside the structure. He and his team continue to work on the hypothesis, in search of definitive evidence of internal ramp structures with the help of 3D scanning technology. Whether concrete proof will ever be found to support one particular theory is yet to be seen. It’s entirely possible, of course, that the Egyptians utilized various construction techniques when building the pyramids, combining levers and both external and internal ramps — as well as other possible methods — to overcome whatever challenges came their way.

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Wednesday, January 15, 2025

How Were the Egyptian Pyramids Built?

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