That was fun! You've combined this chall with the episode like i haven't seen it for a long time. The last part was quite hard but with some thoughts about jeremy bentham und the paths which were clear --> voilà, one solution.
I've been obsessed with that damn cathedral, when the track says it's something visual, is it something that is visible to the naked eye or does it require some kind of steganography tool? I could use a hand to be able to sleep in peace