Most of these facilities are still in use. Some are occasionally decommissioned.
IIRC, one such place out in the woods, back east was decommissioned and purchased for use by amateur astronomers some years back.
They probably had a field day opening the door for the first time. The equipment was all stripped out prior, but I'm sure they got a kick out of the expensive wiring & elaborate shielding everywhere.
Disclaimer: I'm currently working my way through the TV series "24" :-)