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 into which vast resources, technology, and people have been poured, while their purpose and functions remain almost mystically incoherent.

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