In Monroe, Connecticut there was a pretty complete Nike site on the private farm of the Jones family. It stood for a long time until about 12 years ago, when they demolished it to increase their acreage. I used to go there when I was a teenager to explore the tunnels, buildings, and equipment. It was surprisingly well preserved.
Also had a string of on-base military housing from the 50’s. Quite interesting.
There was a Nike base just north of Denton, Texas. It stood empty for years and Univ of North Texas bought it and made it into an observatory. The silos and all the buildings were in pretty good shape up until the mid-late 90’s. Even the big steel silo doors worked.