There are several prominent theories regarding the construction of the Great Pyramid of Giza. One widely accepted theory is the use of a straight or zigzagging ramp to transport the massive stone blocks, though no definitive evidence for such a ramp has been found. Another theory posits that an external spiral ramp was employed, supported by the discovery of traces of such a structure by French architect Jean-Pierre Houdin. A more recent theory suggests a series of internal ramps within the pyramid itself, providing easier access for workers and increased structural stability. Notably, archaeologist Mark Lehner found evidence of a considerable labor force, including worker's settlements, that supports the existence of a highly organized construction effort.
Imagine you are an expert in ancient Egyptian history, discussing the construction methods of the Great Pyramid of Giza. Explain the theories and evidence that support how it was built.