Back when the reference desk at Parks was still at the back of the main lobby, they had a really awesome book, called "The Buildings of Iowa State" or something like that. It only went up through 1980, but it was written by the University Architect at the time, and is a remarkably thorough and fascinating write-up of every single building that has ever stood on ISU's campus. There weren't a lot of secrets, per se, but there is stuff in there that I've never seen mentioned anywhere else. Emergency Hall is one of my favorites! Now that the whole lobby/LCC area got renovated and reorganized, I think those books got moved to University Archives upstairs. Definitely worth your time to sit and read, if you like ISU history. I sat down and read almost the whole thing in about 2.5 hours.