The giant Anunnaki from the planet Nibiru rocketed to Earth 450,000 years ago. They came to mine gold to transship to Mars then rocket back to Nibiru to create a gold-dust shield for that planet. 300,000 years ago in Zimbabwe, these giants adapted their genome to Earth, adding a bit of copper, clay, and a few genes from Bigfoot’s ancestor, Homo Erectus to make us slaves, then bred with the slaves to create a class of slave-overseers . With slave help and the giants’ sonar technology the Anunnaki built huge stone landing platforms, astronomical observatories, smelting plants and palaces.
They built a grid of structures on Earth’s ley line. They built first in the Middle East and the south of Africa, then Egypt, India, Europe, China, Cambodia and the Americas.
They transported whole stones with sonar technology and made concrete out of stones they liquified, poured into forms and hardened. After the Anunnaki and other ET builders employed tools with drilling and cutting capacities beyond any we yet possess (unless our clandestine military has such tools) they pushed the stones into place from their craft or by a 3-foot long sonar device shaped like a ice-cream cone.