During the trip to Egypt years ago, the tour guide explained that no one knows how the Giza pyramids were built because no written records was found, the knowledge was taught and imparted verbally from father to sons. This explanation does not convince me. The Giza pyramids (image taken from Lonely Planet) are so huge and constructed with precise technology, archaeologists presume hundred of thousands workers were needed to accomplish this sophisticated project. I can’t believe not single record is preserved. Could it be the aliens were involved? Like the mysterious crop circles?
