"Some say he levitated the blocks with psychic powers, or by singing to the stones. Others suggest Leedskalnin had arcane knowledge of magnetism and so-called "earth energies.""
https://www.livescience.com/41075-coral-castle.html
"The ancients, some researchers suggest, may have mastered the art of levitation, through sonics or some other obscure method, that allowed them to defy gravity and manipulate massive objects with ease"
"Al-Masudi had traveled much of the known world in his day before settling in Egypt, and he had written a 30-volume history of the world. He too was struck by the magnificence of the Egyptian pyramids and wrote about how their great stone blocks were transported.
First, he said, a "magic papyrus" (paper) was placed under the stone to be moved. Then the stone was struck with a metal rod that caused the stone to levitate and move along a path paved with stones and fenced on either side by metal poles. The stone would travel along the path, wrote Al-Masudi, for a distance of about 50 meters and then settle to the ground. The process would then be repeated until the builders had the stone where they wanted it."
https://www.liveabout.com/the-ancient-secrets-of-levitation-2593647
The Science of Ancient Acoustic Levitation | How The Pyramids Were Built?