Citadel Supreme appears in 24 issues.
The first Fortress of Solitude belonged to Doc Savage, the original for Superman. The second and most famous Fortress is Superman's headquarters created by the Eradicator. It contains various Kryptonian artifacts as well as a way of communicating with Jor-El.
The Hell of Mirrors is a special prison designed by Supreme to safeguard his enemies. Once the prisoners are thrown inside the looking glass, they cannot escape. It is located somewhere inside the Citadel Supreme.
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