The Fortress of Solitude is a vast sanctuary hidden somewhere in the Arctic. It appears to be built entirely from either crystal or ice. 
Inside, the compound houses a display of items Superman collected over the years from his adventures, as well as statues of his parents. Also present is some form of interactive computer database.
At some point in the history of Earth-Prime, three rings that could absorb and emit Kryptonite radiation were stored in Fortress. The Jarhanpurian named Rama Khan claims that they were his and were stolen from him long ago.
Angry that Kara planned to use Myriad after saying that it was forbidden, Lena Luthor was teleported to the Fortress. Unbeknownst to her, a Morae who worked for Leviathan traveled with her. As Kara and Lena argued about hypocrisy, the Morae agent opened the cage to a baby Sun-Eater.
Later, Lex Luthor noticed that he had access to the Fortress through the teleporter; while he was there, he stole something for Leviathan to be used against Supergirl. It was Rama Khan's rings.
Clark had brought Jordan to the Fortress after he manifested some abilities and wished to test for more information. However the A.I of Jor-El concluded that Jordan's powers were a result of brief flare ups and that his human DNA would limit him.
Known stored items
Current stored items
Former stored items
Superman & Lois
|Other versions of Fortress of Solitude (Earth-Prime)|
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|Earth: 38 • 86|