About 10 years ago, at a local Target, they were refilling the ATM machine. I was also fascinated with the inside of the ATM, but the security guard didn't allow me to go anywhere near to the machine to see the inside. In fact, the security guard politely, but firmly asked me to leave, otherwise, he told me that he would take me away.

So, based upon what I have experienced, it's no surprise that they arrested somebody for taking the photo.

Many larger places in the world use EPICS (Experimental Physics and Industrial Control System). An experiment I am a (small) part of use EPICS for control.
It is an open source control systems frequently used for particle accelerator control and observatory telescope control. We use it slightly differently, but for what we need to do, it works very well. It is maintained primary by Advanced Photon Source at Argonne National Laboratory. You can read more at the following URL:
http://www.aps.anl.gov/epics/
In case you are wondering, no, they don't use EPICS for LHC. They use a commercial SCADA program called PVSS (for the most part anyway).