Zone-O-Phone appears in 14 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.
Jor-El (Superman's Kryptonian father) discovered this dimension absent of time and space. He believed the dimension to be an ideal prison and alternative to death for the criminals of Krypton.
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