When working on Mr. Bean I needed to go to the National gallery, for research, as one of the episodes played there.
I was not allowed to take any photos as that is against their rules, so I asked if thy had photo material that I could use. I was told to contact the Press department which refused to help me as I was not a member of the press.
Jill, our producer, then rang, asking if we could have archive material and was told to submit the episode's script for approval by the galleries director, before they would consider our request... good grief.
In the end I just took a morning off and went sketching, which you are allowed to do in pencil, ballpoint and crayon, without special permission...