This old latrine building in Lindisfarne Castle, Northumberland is repurposed as a tech closet. The shaft of the latrine is used to run cables from the ground level up to the top.

Aww, cripes. I didn't know I'd have to write a description. How many words is that so far, like a hundred? Soooo, yeah. Mildly interesting stuff. Stuff that interests you. Mildly. It's in the name, ffs.