[Note: This took place before it was announced that Nottingham City Council have sold the library building as office space. At time of writing there is no clear plan as to what they are going to do with the library].
I managed to visit three different sites during Heritage Open Weekend in September, (yep, that behind with writing things up again!) where places in England open up for free or access is granted to places normally closed to the public. One of the options available that caught my eye was a behind the scenes tour of Nottingham Central Library which is my local library.