One thing that I enjoy about working for a very large urban system, is that we have so very many different locations. I've been to about 25% of our 72 branches. I've always thought it would be an interesting project to get out and visit Every Single Branch, No Exceptions. Our new City Librarian, Martin Gomez, has stated that he does want to get out there and do just that.
Then, I ran across Candace Ryan's blog Book, Booker, Bookest. She's highlighted a goodly number of Los Angeles Public branches (she visits other Southland libraries too.)