🇺🇸 United States · Ancient technology
Atlantean Crystal Power Plant (Edgar Cayce's 'Great Crystal')
Claimed 10,500 BCE Atlantean high-tech; literature 1924–44 Cayce readings · Claimed Atlantean (Poseidia) high civilization
Cayce's 1933 Tuaoi Great Crystal powering Atlantis — 1968 Bimini prophecy drove beachrock Atlantis hunt.