The Pyramids were built by an alien group called Ra to heal people. Earths frequency has changed since the thousands of years since they were built so they do not work anymore. Like a piano out of tune.

The Pharaohs believed they would start working again so they buried themselves inside in hopes Ra would come back and tune them again thus bring them back to life.

Healing centers that were meant for the people and kept from the people by the élite.