Can anyone tell me which classic Superman comic (from the 60s & 70s) was the very first time that showed how Superman built the Fortress of Solitude?
1 Answer
Based on your description, that would be Superman #176 from 1964 in which we see Superman constructing his "Fortress of Solitude" with his bare hands from the side of a mountain on the outskirts of Metropolis.
Note that before this one, he'd already had several other hideaways including an Arctic Citadel, a meteor base and an undersea fortress which we see him constructing in Action Comic #144 from 1958.
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Interesting. The "Artic Citadel" sounds more like the Fortress of Solitude we all know and love. I'll have to look that one up. Commented Jul 1, 2015 at 20:32