I feel really sad about this -- I was amazed as a child to learn that I was allowed to just... GO IN to buildings and lectures as long as I was quiet and respectful. I always took pride in my university's openness.

Then I took my boyfriend for a tour a couple years ago and found all the buildings had signs warning that access was only permitted with a University ID card. Nobody challenged us or kicked us out, but it was a sour demoralizing shock.