Hi All,
I'm kinda new here but I know of a Nike missle site on Sandy Hook in central NJ. It is a part of the US Army's Fort Hancock facility and is now a part of Gateway National Park. I took my daughters to tour the engagement control station where the launch controllers were stationed.
They didn't show us the missle silos since they were down range a good way, and I'm unsure of their current status (filled in or not). There is a fence, but I'm sure the site could easilly be accessed when they open up for armed forces and veterans day, there are trails all over that area as well that lead to other WWI and WWII era bunkers.
See Ya!
Harry