Huge shoutout to these employees who showed caution and care for the customers. Their intervention may have prevented something truly terrible from happening.
You can find various online sources. However, Wikipedia claims that in addition to the regular "business" of housing POWs during the Civil War, there were horrible things that took place here during that time.
In my opinion, books that are overtly sexual in nature don't have a place in elementary schools--or even perhaps in middle schools, for that matter. But here's part of the controversy: different people have different ideas about what 'overtly sexual' means.