Question: where did the fortress of solitude come from

title: Fortress of Solitude
text: When the crystal was later recovered by Lex 's sister , Tess Mercer , as she searched for the now deceased Lex in Northern Greenland , Clark successfully rebuilt the Fortress to resume his training with Jor - El as well as to remove Brainiac from Chloe Sullivan . After completing this Jor - El told Kal - El that he was proud of him and will help in his fight with Doomsday . After Clark leaves Brainiac who has been hiding within the crystal console in his liquid form takes over the Fortress and changes the entire building black and produces the symbol for `` Doom '' on the floor . Chloe is then brought back to the Fortress after Doomsday crashed her and Jimmy 's wedding where Brainiac downloads himself into Chloe leaving the Fortress itself and began to physically download all the knowledge into himself via Chloe . Brainiac then places Davis Bloom , Doomsday 's human form in a Kryptonian chamber where it will take days to permanently transform him into Doomsday . After Brainiac was defeated by Clark and the Legion of Super Hero 's Brainiac 's connection to the Fortress was terminated and all the knowledge he stole returned as well as the Fortress turning back white . A few months after Jimmy was killed Clark was able to repair the Fortress and his connection to Jor - El to resume his Kryptonian training . Although fully repaired there were still a number crystallized pillars that were still black after Brainiac was defeated . However , it was discovered that the Fortress was repairing itself and by the following year after Clark defeated Zod all the black crystal pillars were destroyed with Fortress of Solitude fully repaired and purged of corruption ready to serve Clark in his quest to become Superman . During the series ' tenth and final season , the Fortress became home to a Martha Kent - crafted , classic Superman costume , which Clark would go on to don in the final episode . Rather than being specifically made for the production , the costume was originally designed and created for Brandon Routh to wear in Superman Returns .