here and image.
Works of fiction can present fictional walks around real cities or fictional cities. There are a lot of both kinds of cities in these blogs:
the fabulous city of Ys
James Blish's flying cities
Isaac Asimov's planet-wide city of Trantor
San Francisco Integrate
The United States of Earth DC is a patchwork of cities that do not exist on Earth Real. It is after midnight in Lancaster and I still aim to watch a Smallville dvd.