I've found a billion articles mentioning that the Cinderella Castle in Disney World is about 185 feet (60 meters) tall, and built with forced perspective so it looks bigger. But I simply couldn't find any answers, or even any questions or speculation about: if the castle was real, if humans had to live and work in it, how big would it have to be?
In other words, to what scale is it built? (On average, I guess, given the forced perspective.)
(I'm surprised so few people apparently think about that, it's one of the first things which springs to my mind.)