Scribbles and Horrors

Abandoned missile silos and bunkers are particularly dungeon-like places. Beyond just being big underground complexes with lots of empty space, they are places where vast resources, technology, and people were poured into their construction, but their purpose and function remain almost mystically incoherent.

A missile silo is a complex in the middle of nowhere whose sole purpose is to be able to completely obliterate some as-yet-unchosen corner of the world, and maintaining this structure somehow means cataclysmic war is less likely. Their logic is twisted and insane. As fundamentally evil as it is cleverly built.