Somewhat on topic, but in Colorado we have 6 of the original Titan I nuclear complexes. Abandoned since 1965, each complex has probably a mile of tunnels, huge underground rooms and 3 massive silos. They're absolutely fascinating to explore.
Some random photos from the last time we went in to one.
Super curious! I'm taking a road trip through Colorado later this year, and would love to stop and see one or more of these. I'm a little worried about playing whack-a-mole trying to find an accessible one. Is Jim's listing of them here accurate? http://w3.uwyo.edu/~jimkirk/titan1.html Is there a better source?
Those are always the place I assume that most people assume are totally safe and spelunk and climb and explore only to find out later they have way more radiation or something 'new' bad thing that all those people were now exposed to.
Edit: Of course there's still risk. Plenty of obvious asbestos about as well as physically precarious flooring, deep standing water, angry farmers that don't want you on their land, etc. Lots of fun though :)
Some random photos from the last time we went in to one.
https://www.instagram.com/p/BLysXzHjG58/?taken-by=hamonacob
https://www.instagram.com/p/BK3fsXFjwE6/?taken-by=hamonacob
https://www.instagram.com/p/BCqaiG-KHGF/?taken-by=hamonacob
Happy to answer any questions for the curious.