The Caves of Steel
The first post-"Infinite Crisis" version of the series as published in the "three-boot" edition has described Metropolis as having expanded over the intervening millennium up the "entire Atlantic seaboard" of North America in one issue (reminiscent of New York's future expansion in Isaac Asimov's "The Caves of Steel" and in Poul Anderson's "The Corridors of Time", and to an extent "Mega-City One" of the "Judge Dredd" comics). In "", it is revealed that this version of Metropolis belongs to the newly restored Earth-Prime's 31st Century.