Kandor is a miniaturized city populated with people from various alien cultures. It is named after the original Kandor City, a lunar colony from Superman's home planet, Krypton. Superman keeps the shrunken city inside the Fortress for safe-keeping. It is possible to be shrunk down and placed inside Kandor with the right magic.

This is a highly controlled environment filled with exotic and often endangered creatures from around the galaxy. Some of the animals found in the habitat include, the Metal Boar, the Black Mercy, the Duplorian Hawk and the Thought-Beast.

Superman maintains a gallery of artifacts and souvenirs that he has acquired over the span of his career. Inside are several scale models and dioramas of Krypton and its cities. The trophy room also contains a gallery of statues commemorating other heroes he has worked with, including the JLA and the Legion of Super-Heroes.

Superman's laboratory is one of the most highly advanced science labs in the world. Here he studies the substance known as Kryptonite in the hope of finding a way to reverse its effects on Kryptonian physiology. He also uses the lab in an attempt to cure Daxamite lead poisoning, so that he might one day free his friend Mon-El and from the Phantom Zone. Superman also uses the lab in the hopes of finding a way to restore the people of Kandor to their normal size.

A portal in name only, this is actually a large circular window into the Phantom Zone. By operating a controller, Superman can analyze various depths and regions of the Zone. Developed by his later father Jor-El, this device is used to transport living matter directly into the Phantom Zone. It was first used to sentence the mad Kryptonian scientist, Jax-Ur, into exile after his experiments with intersteller travel caused the destruction of a Kryptonian lunar colony.