1. Atlantis, the island of Atlas, is our solar system
The quotations (in italics) are taken from Plato's Critias, and more precisely the translation in the pdf below (unless otherwise stated):
Platon_Critias_extract_english
Poseidon fell in love with her and had intercourse with her, and breaking the ground, inclosed the hill in which she dwelt all round, making alternate zones of sea and land larger and smaller, encircling one another; there were two of land and three of water, which he turned as with a lathe, each having its circumference equidistant every way from the centre, so that no man could get to the island, for ships and voyages were not as yet.