Some of you who live in the southwest may know of Tucson's siren graveyard, which contained all the old Civil Defense sirens Tucson used during the Cold War. There are several videos of it on YouTube, the earliest dating back to 2009. Back in 2009, the graveyard consisted of Thunderbolt 1000's, and SD-10's. A friend I know of by the name of tboltmaniac has documented the siren graveyard as well. He has a YouTube channel, too.
However, I made this post toward people who are looking to go to the siren graveyard as of 2016. Me and tboltmaniac exchange messages on Facebook. To anyone who want to go to the graveyard, the only thing that's left is a couple of control panels, mostly rusted, and one last SD-10 buried under 2 to 3 tons of metal poles.
Just thought I'd let you know. If you still want to check it out, I'll give you the coordinates.