A long time ago, when I was just starting in the "troof", I brought my camera to the hall, and I was taking pictures of just about anything there. I love taking pictures, so I wanted a few pictures of sexy sisters of my fellow witnesses and a few pictures of the hall to show my family.
But, I had the impression that it wasn't ok to do that. I felt as if being new to the org, that they tolerated it so I never did that again.
I know that in certain places, like government buildings or military installations, you're not allowed to take pictures.