This is a topic that fascinates me and I'm eager to start reading about the history of the underground railroad.
We have several homes in my town which were part of it and my sister was telling me last night about two buildings in Burlington, VT that had tunnels running between them. (Turns out one was later converted to a fraternity house and the other to a sorority house in which she lived. The tunnel was used for midnight visiting.) She also told me that the underground railroad ran from Burlington to Canada. I had no idea.
I've seen these quilts and - despite any argument about the authenticity of the blocks - they are great.