OK Ed. I would recommend 'Rendezvous with Rama' trilogy by ACC, or The City and the Stars which you may find paerticularly interesting as it may have some parallels to AB ;-)- The city of Diaspar is completely enclosed. Nobody has come in or left the city for as long as anybody can remember, and everybody in Diaspar has an instinctive insular conservatism. The story behind this fear of venturing outside the city tells of a race of ruthless invaders which beat humanity back from the stars to Earth, and then made a deal that humanity could live - if they never left the planet.
As for Michael Moorcock, you can't beat Dancers at the End of Time. YTou may then like to read some of the other books with Jherek Carnelian as a character at various points throughout time and his various incarnation's. Note his initials (I wont say any more).