Despite being one of the most recognizable elements of Superman’s mythology, the Fortress of Solitude was never officially introduced in the DCEU. Popularized among general audiences by Richard Donner's classic Superman, the Fortress of Solitude would later appear in many television shows, animated series, and video games. In live-action, Clark Kent's secret arctic base has been featured in Smallville, Krypton, Supergirl, and most recently in Superman & Lois.
In the comics, the Fortress of Solitude was originally called the Secret Sanctuary and was located near Metropolis, rather than the North Pole. After Crisis on Infinite Earths, it was established that the Fortress was located at the North Pole and built by Superman himself. It contains much of Superman's hoard of Kryptonian technology, including the ship that brought him to Earth, a projector for the Phantom Zone, and in some iterations even the bottled city of Kandor.
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It always seemed like the Kryptonian scout ship in Man of Steel was supposed to be a reimagined version of the Fortress of Solitude. According to director Zack Snyder, however, they never envisioned an actual Fortress for the DCEU's Superman. Instead, the Fortress was reimagined as an internal place for Clark and his struggles, exemplified in Batman v Superman: Dawn of Justice when he believes he is talking to his late father in the mountains.
That's in line with how Snyder and Christopher Nolan—both responsible for Man of Steel's story, alongside David Goyer—usually adapt elements from the comics to the big screen. Both Nolan and Snyder's DC films are known for being realistic, darker takes on classic comic book characters, with
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