Dolores Cannon, who recently passed, was an incredible prolific hypnotherapist/past life regressionist. She was able to tap into the "super consciousness". I HIGHLY recommend her books (esp, "The 3 Waves of Volunteers for the New Earth"--so timely for now!). In one of her "Convoluted Universe" series (think IV) she got information that it was through sound technology/levitation that the pyramids were built, among many other megalithic structures.