Fortress of Solitude illustration from my new Superman picture book
Richard Donner Superman movie 1978
The original fortress from the silver age was built into the side of an artic mountain and Superman (or another kryptonite) could only lift the gigantic golden key to unlock the equally huge door to get in. I opted to stay true to the version of the fortress that Richard Donner created in the 1978 Superman movie and the one which Bryan Singer stayed pretty true to in Superman Returns. Smallville also depicts that version so I wanted to stay close to what fans recognized including adding the aurora borealis.