You must be speaking about Limestone. I've been there too. It's closed now but they're still making some use of the old base. I've been out to where the POWs were housed in that area and over in a couple of other places up that way. There's one, slightly less known about, near Jackman, Maine. I've had more time to spend there than anywhere else in the area. By Maine standards, I'm sort of close to Limestone but the adage is true, "Ain't no way to get there from here." (It's a bit of a haul from home to Limestone by regular road. I can actually do it faster in the winter because there's a snowmobile trail that will take me over that way. Welcome to Maine.)
The complex you mention, I've not been to that one. I'll have to check it out when I get up that way again. My home is in Maine but I travel a lot. I'm actually wintering at a house I own in Florida. However, I expect I'll be out in the ND area before too long so I've bookmarked it and will look into it when I can get out there. It's bound to have interesting things - so I'll stop in when I'm out that way. Thanks!
The Cold War has left some interesting infrastructure all around. I did, with some degree of seriousness, consider an old missile silo purchase. I even made several inquiries. I should think it'd be neat to live in one.
There's now a minimum security prison there but in Charleston, Maine there's an old base. It was never very large and did just RADAR and communications. It was put up during WWII but managed to live on for a while afterwards. I think they closed in the 60s or 70s. There's some neat stuff there that I've had the chance to visit. I know one of the staff members and we've managed to bluff our way onto the facility a few times. It doesn't have fences or the likes, it's not like people are going to get far if they do escape and everyone there is a minimal security inmate.
I've got some pictures of my findings. I am unable to find them right now - even though I'm connected to my network at home in Maine. I'll keep looking but I spent a while already. I know I even put them in a special folder... With sub-folders... I'll just dump 'em online somewhere when I find 'em again and link you if I remember. I've had occasion to visit a few such places and a number of other types. I'm more of a WWII student but the Cold War was interesting - I lived through much of it as, presumably, you must have - given the date of closure for Limestone.
Anyhow, no worries. I will just blame it on the fact that I'm not nearly as articulate as I'd like and that trends to verbosity in an effort to clear things up. It's bound to be difficult for others to parse and tone is even more difficult to translate. I've set about trying to find some pictures but I'm now processing the data by date. That's gonna take a while. Should I find any, I'll upload and link.