The history of Earth in a parallel world called Craton is carved into the walls of a Mayan temple.
At the end of the parallel world's history, after three brutal Earth-Moon wars devastated the planet, robots and aliens, thoroughly disillusioned with humanity, transformed the Moon into a colossal spherical interstellar spacecraft and piloted it out of the solar system.
Without the Moon's tidal pull, Earth was engulfed by towering waves for millions of years, erasing every trace of civilization from the blue planet, including the Mayan temple. The few surviving humans fled aboard spaceships and emigrated to Mars, becoming aliens on Mars.
