KANDOR!! That's the name of the little City......
http://theages.superman.ws/swan.php
"The comics, I decided, were not a bad place for an artist to make a career, after all. Where else could you have the fun of creating an entire city in a bottle? I think Al Plastino had first drawn Kandor, the Kryptonian city that had been miniaturized by the villian Brainiac and thus escaped the destruction of Superman's native planet. But I had a lot of fun inventing all that tiny futuristic architecture, not to mention the view from inside the bottle - with the "giant" figures peering in. I've always regretted that Al Plastino and I never got to play golf together, another passion that we shared......"