simple enough, it is the options menu when u pause the game and go to the options menu,
aka fortress of solitude.
litterally it is supermans crib basicly and how his father gave him the gift of knowledge
with the crystals

if this is a question regarding going to the fortress of solitude to enter cheats. dont go
there, for cheats, enter them at the pause screen.
if this not what u r looking for, then refer to the previous answer.