Boundless Realm

There is an enormous amount of detail and history in this book.
There was too much metaphysical and/or metaphorical analysis, like a discussion of whether the Doombuggies going backwards was supposed to make us feel like we had died and were on our way to the afterlife or were we just reenacting the Brides fall from the roof.
I'm pretty sure no-one is actually scared during the ride but some of the book is about the horrors
induced in the riders by the positioning and colors of different things.

But all that aside, I enjoyed the book, I liked the comparisons between the various versions of the Mansion and the history and changes over time.
If the Mansion is high on your list of favorite rides, you'll find even more to like in here.