West coast target 3 (preceded by someplace, AK and Seattle, WA) during The Cold War led to a local government nuclear bunker. It's got everything from a big control room to classrooms to a VARIAC book I found in the data room. Haven't been in at least a few years, but the repeated illegal entries by many people led to all upper entrances being filled with cement. The upper entries, of course, are just below ground level.
The Day Called X