On Earth-9 (Tangent Comics) the city of New Atlantis was founded atop the ruins of Atlanta, Georgia, after the Florida peninsula was destroyed in that world's version of the Cuban Missile Crisis.
On Earth-50 (Wildstorm Comics) the city of Atlantis was founded by two alien races known as the Kherubim and the D'rahn, both races were allied against their mutual enemies the Daemonites.