Here’s that VR tour of an abandoned US ICBM silo which J.G. Ballard mentioned. Don’t mind the authentic 1995 background GIFs, frames, and big navigation buttons; it’s an amazing site, full of great little observations like:
Note that all of the overhead lights in the facility are mounted on shock-resistant springs so that if the complex were bombed, the ground could shake without burning out the lightbulbs.
Kevin Kelm and his co-explorer certainly did their homework and explored the silo thoroughly, and the descriptions read like an adventure game. Very spooky!