How were the Pyramids of Giza built?

Egypt’s Pyramids of Giza were built to endure an eternity, but how remains one of the ancient world’s greatest mysteries.
La Brújula Verde

An Italian engineer claims that the Great Pyramid of Khufu may be more than 20,000 years old, according to the controversial “Relative Erosion Method”

A preliminary study, based on a new method for dating ancient structures, suggests that the Great Pyramid of Khufu in Giza could be tens of thousands of years older than what traditional Egyptology ...