The least talked about conspiracy theory/alternative history idea (the Saturn Polar Configuration by David Talbott) is by far the most important. Description in comments

SS: In his groundbreaking book from 1980 ‘The Saturn Myth’ (inspired by the work of Immanuel Velikovsky who had correspondence with Einstein about his ideas) researcher David Talbott analyzed myths from ancient cultures around the world and found that they all described the same phenomenon surrounding Saturn. He found that symbolism for Saturn is the same throughout ancient Mesopotamia, India, Greece, the Americas, and Egypt, and as documented by ancient cultures, explains how there was once a celestial alignment involving Saturn that occurred thousands of years ago. Based on ancient accounts throughout the world, Talbott describes a period of “great upheaval” in celestial bodies, when Saturn, Venus, and Mars descended and aligned overhead Earth in a spectacular astronomical event dubbed the “Saturn Polar Configuration”. As Talbott says in ‘The Saturn Myth’: “[The Saturn Polar Configuration is] the idea based on comparative mythology, that the Earth was once in close proximity, or even a satellite of the planet Saturn”. During this celestial upheaval, Mars descended from its position in the sky and formed a stairway to Saturn and Venus which over time became morphed into various mythological concepts, including the heaven-sustaining giant Atlas, the Tree of Life, Mount Olympus, the Boat of Ra, and the Tower of Babel, inter alia. Various cultures around the world recorded this celestial stairway. For example, the Makirtare Indians of the Amazonian rainforest tell of a time where the hero Ahishama, identified as Mars, climbed a stairway to Heaven. Talbott calls this stairway the “Cosmic Mountain”.